What Holding a Grudge Actually Does to Your Body (The Health Effects May Surprise You)

Have you ever replayed an argument in your head, remembered someone who betrayed you, or found yourself feeling angry all over again whenever you think about something that happened years ago? You might believe that holding a grudge is simply an emotional response to being hurt, but its effects can extend far beyond your thoughts and feelings. Research suggests that prolonged anger, resentment, and unresolved emotional stress can influence several physical processes in the body, including blood pressure, heart health, sleep, immune function, and digestion. In other words, the emotional weight of holding on to the past may have consequences for your physical well-being, too.

The truth is that holding a grudge does not necessarily mean you are a bitter person. Sometimes, it means you were deeply hurt, betrayed, disrespected, or never given the apology or closure you deserved. However, when those painful experiences continue to occupy your mind, your body may repeatedly respond as though it is dealing with a stressful situation. According to research discussed by institutions such as Johns Hopkins Medicine, the Mayo Clinic, and the National Institutes of Health, chronic anger and stress can affect the body in meaningful ways. Understanding what happens inside your body when you hold on to resentment may help you recognize why emotional healing is an important part of taking care of your health.

1. Your Body Stays in Stress Mode

One of the most significant effects of holding a grudge is prolonged stress.

When someone hurts you, your brain may interpret the experience as an emotional threat. Remembering the incident, imagining what you wish you had said, or anticipating another confrontation can reactivate your body’s stress response.

This response involves the release of stress hormones, including cortisol and adrenaline. These hormones prepare your body to respond to perceived danger by increasing alertness, changing heart rate, and directing energy toward immediate survival.

Normally, this response settles down once the stressful situation passes. However, repeatedly revisiting painful memories and unresolved conflicts can contribute to ongoing emotional stress.

According to the American Psychological Association, chronic stress can affect multiple body systems, including the cardiovascular, digestive, muscular, respiratory, and immune systems.

What this means for your body: You may experience persistent tension, irritability, headaches, fatigue, and difficulty relaxing, even when there is no immediate threat around you.

Your mind may be thinking about something that happened months or years ago, but your body can still respond to the emotional distress associated with it.

2. It Can Raise Your Blood Pressure

Holding on to anger and resentment may also affect your cardiovascular system.

When you become angry, your body activates its stress response. Your heart rate can increase, blood vessels may constrict, and blood pressure can temporarily rise.

Although occasional increases in blood pressure are part of the body’s normal response to stress, repeated episodes of anger may become concerning.

A 2024 study supported by the National Institutes of Health found that even a brief period of anger could impair the ability of blood vessels to expand properly. The researchers observed that this effect lasted for up to 40 minutes after participants completed an anger-inducing task.

While this study examined short-term anger rather than long-term grudges specifically, it offers insight into how negative emotional experiences may affect cardiovascular function.

When anger becomes a recurring part of everyday life, the repeated physiological stress may contribute to a less favorable environment for heart health.

What this means for your body: Repeated anger and stress may contribute to elevated blood pressure and other cardiovascular concerns, particularly when combined with other risk factors.

Your heart deserves attention, and managing emotional stress can be one part of a broader heart-healthy lifestyle.

3. It May Increase Your Risk of Heart Problems

Your heart does more than pump blood. It also responds to changes in your emotional state.

Research has increasingly explored the connection between anger, psychological stress, and cardiovascular health. Repeated episodes of intense anger may affect blood vessel function, heart rate, and other processes involved in maintaining a healthy cardiovascular system.

A study highlighted by the National Institutes of Health in 2024 found that anger could temporarily interfere with blood vessel dilation. This matters because healthy blood vessels need to expand and contract properly to regulate blood flow.

Long-term research is still needed to establish precisely how chronic resentment affects cardiovascular disease risk. Nevertheless, the findings reinforce the importance of understanding the physical effects of recurring anger.

Johns Hopkins Medicine also highlights research connecting chronic anger and unresolved resentment with changes in heart rate, blood pressure, and immune responses.

What this means for your body: Continually experiencing anger and emotional stress may place additional strain on your cardiovascular system.

Letting go of resentment is not a replacement for medical care, exercise, or a balanced diet. However, learning to manage chronic anger may support your overall heart health.

4. It Can Interfere With Your Sleep

Have you ever tried to fall asleep but found yourself replaying an upsetting conversation instead?

You remember what someone said, imagine how things could have gone differently, and start thinking about all the things you wish you had done or said.

This is one way resentment can interfere with sleep.

Emotional distress and unresolved anger can make it difficult for your mind to settle down. Instead of transitioning into a relaxed state, you remain mentally engaged with the experience that upset you.

Stress can also interfere with the body’s natural sleep-wake processes, making it harder to fall asleep or stay asleep.

Over time, insufficient sleep can affect concentration, mood, energy levels, and overall health.

The Mayo Clinic identifies poor sleep as one of the potential consequences of chronic stress. Johns Hopkins Medicine also identifies improved sleep as one of the potential benefits associated with forgiveness.

What this means for your body: You may experience restless nights, difficulty falling asleep, frequent waking, and daytime fatigue.

The more frequently you revisit painful experiences before bedtime, the harder it may become to establish a peaceful nighttime routine.

Learning to process difficult emotions during the day, rather than allowing them to dominate your thoughts at night, may help support better sleep.

5. It May Affect Your Immune System

Your immune system protects your body against infections and other health threats. However, prolonged psychological stress can influence how your immune system functions.

When your body experiences stress, it activates several hormonal and physiological processes. These responses are helpful in the short term, but prolonged stress can disrupt normal immune regulation.

Research on chronic stress has associated prolonged stress exposure with changes in immune function and inflammatory activity.

Because holding a grudge can involve repeatedly experiencing anger, frustration, and emotional distress, it may contribute to the overall stress burden your body experiences.

The Mayo Clinic explains that chronic stress can weaken immune defenses, potentially making it more difficult for the body to respond effectively to certain health challenges.

It is important to understand that having a grudge does not automatically make you sick or cause an infection. Rather, persistent emotional stress can be one of several factors influencing immune health.

What this means for your body: Chronic stress may interfere with healthy immune functioning, especially when combined with poor sleep, inadequate nutrition, and other lifestyle stressors.

Taking care of your emotional well-being is one way to support your body’s overall ability to stay healthy.

6. It Can Cause Muscle Tension, Headaches, and Physical Discomfort

Emotional stress does not always show up as sadness or anger. Sometimes, it appears as physical discomfort.

When you experience stress, your muscles naturally tense as part of the body’s protective response. This is particularly noticeable in areas such as the neck, shoulders, jaw, and back.

If stress becomes chronic, that tension may persist longer than it should.

For someone holding on to resentment, repeatedly thinking about a painful experience can trigger emotional distress and physical tension.

The American Psychological Association explains that chronic stress can keep muscles in a prolonged state of tension, potentially contributing to stress-related physical problems.

You may notice symptoms such as:

Frequent tension headaches.
Tightness in your neck and shoulders.
Jaw clenching or teeth grinding.
Muscle soreness and stiffness.
General body discomfort.
Feeling physically exhausted despite getting enough rest.

These symptoms can have many possible causes, so persistent or severe discomfort should be evaluated by a healthcare professional.

However, managing emotional stress, practicing relaxation techniques, and addressing unresolved feelings may help reduce one potential source of physical tension.

7. It Can Affect Your Digestive System

Your brain and digestive system are closely connected. This relationship is commonly known as the gut-brain connection.

Emotional stress can influence digestive activity, gut sensitivity, and the way your body processes food.

That is why stressful experiences sometimes lead to stomach discomfort, nausea, changes in appetite, or digestive disturbances.

When you continually dwell on a painful experience, you may experience recurring emotional stress that affects your digestive system.

The American Psychological Association identifies the gastrointestinal system as one of the body systems affected by stress.

Depending on the individual, stress-related digestive symptoms may include:

Stomach discomfort.
Bloating.
Changes in bowel habits.
Nausea.
Reduced or increased appetite.
A sensation of having a knot in your stomach.

Of course, digestive symptoms are not necessarily caused by resentment. Food intolerances, infections, medications, and underlying medical conditions can also contribute to these problems.

Still, recognizing the relationship between emotional stress and digestive health can help you understand why taking care of your mental well-being matters.

8. It Can Increase Anxiety, Irritability, and Depression Symptoms

Not all the consequences of holding a grudge are physical. Some of the most noticeable effects happen in your mental and emotional health.

When you hold on to resentment, your thoughts may repeatedly return to the person or situation that hurt you.

You may find yourself questioning your worth, wondering why someone treated you that way, or imagining what would happen if you confronted them again.

Over time, this pattern can contribute to emotional exhaustion.

According to the Mayo Clinic, holding on to resentment and bitterness may be associated with anxiety, irritability, depression symptoms, and difficulty enjoying the present.

Harvard T.H. Chan School of Public Health has also highlighted research connecting unforgiveness with higher levels of depression, anxiety, and cardiovascular problems.

This does not mean that everyone who holds a grudge will develop a mental health condition. Rather, prolonged resentment can become another source of emotional distress, particularly when it interferes with everyday life.

What this means for your well-being: You may become more emotionally reactive, struggle to trust others, withdraw from relationships, or find it difficult to experience happiness without thinking about the past.

If these feelings become overwhelming or interfere with your daily activities, speaking with a mental health professional can help.

9. It Can Damage Your Relationships and Make It Harder to Trust People

Another overlooked consequence of holding a grudge is how it can influence your relationships.

When someone hurts you, it is natural to become more cautious about trusting that person again. Sometimes, that caution is necessary, especially when someone has repeatedly demonstrated harmful behavior.

However, unresolved resentment can sometimes extend beyond the original relationship.

You might begin expecting new friends, romantic partners, or colleagues to hurt you in the same way.

As a result, you may become more defensive, suspicious, or emotionally distant.

For example, someone who experienced betrayal in a previous relationship might struggle to trust a new partner, even when that person has done nothing wrong.

The Cleveland Clinic explains that resentment can affect relationships, trust, and the ability to communicate effectively with others.

What this means for your well-being: The emotional consequences of one painful experience may begin influencing relationships that had nothing to do with the original situation.

Recognizing this pattern does not mean ignoring what happened. It means giving yourself the opportunity to build healthier relationships without allowing past experiences to dictate every future interaction.

10. It Can Keep You Emotionally Stuck in the Past

Perhaps one of the most difficult effects of holding a grudge is that it can prevent you from fully enjoying the present.

When you continually revisit something painful, a significant amount of your mental energy remains focused on an experience you cannot change.

You might be physically present with friends, enjoying a special occasion, or working toward an important goal, but mentally, you are still thinking about what happened.

This can make it difficult to appreciate positive experiences.

The Mayo Clinic explains that holding on to resentment can make people so focused on past wrongdoing that they struggle to enjoy the present.

In a sense, the person who hurt you may no longer be part of your everyday life, but the emotional experience continues to occupy space in your mind.

What this means for your well-being: You may miss opportunities to experience happiness, build meaningful relationships, and create new memories because your attention remains tied to the past.

You cannot change what someone did to you. However, you can gradually change how much influence that experience has over your present life.

Why Is It So Hard to Let Go of a Grudge?

If holding on to resentment can be emotionally and physically exhausting, why do so many people struggle to release it?

The answer is not as simple as choosing to forget what happened.

Sometimes, a grudge represents an experience that deeply affected your sense of safety, trust, dignity, or self-worth.

You might feel that forgiving someone means accepting what they did, allowing them to escape accountability, or pretending that the experience did not hurt.

Other times, you may be waiting for an apology that never comes.

There are also situations in which the person who caused the pain continues to behave in harmful ways, making emotional distance necessary.

The important thing to understand is that letting go of resentment does not mean approving of someone’s behavior.

According to the Mayo Clinic, forgiveness does not require forgetting, excusing the harm, or rebuilding a relationship with the person who hurt you.

You can acknowledge that someone treated you unfairly while deciding that you no longer want the experience to control your emotional well-being.

Forgiveness is a personal process, and it does not have to happen immediately.

How to Let Go of a Grudge Without Ignoring Your Feelings

Letting go of resentment is not about forcing yourself to feel happy or pretending that everything is fine. It is about processing what happened and finding healthier ways to move forward.

Here are some practical steps that may help.

1. Acknowledge That You Were Hurt

The first step is recognizing your emotions instead of pretending they do not exist.

You are allowed to feel angry, disappointed, betrayed, or sad. These feelings do not make you a bad person.

Give yourself permission to understand what happened and why it affected you so deeply.

2. Stop Replaying the Situation Whenever Possible

It is natural to revisit painful experiences, especially when you feel that something was left unresolved.

However, repeatedly replaying the same situation may keep you emotionally connected to the distress.

When you notice yourself returning to the same thoughts, gently redirect your attention toward something meaningful in the present.

This might involve going for a walk, engaging in a hobby, spending time with someone you trust, or practicing mindfulness.

3. Set Healthy Boundaries

Forgiveness does not mean giving someone unlimited access to your life.

If someone repeatedly disrespects, manipulates, or harms you, setting boundaries may be necessary.

You can choose to release resentment while maintaining distance from someone who is not safe or healthy to have around.

Your emotional and physical safety should always come first.

4. Consider Journaling Your Feelings

Writing down your thoughts can help you organize complicated emotions.

Try describing what happened, how it made you feel, and what you wish had been different.

You can also write about what you want your life to look like moving forward.

The goal is not to keep documenting the wrongdoing indefinitely. Instead, use writing as an opportunity to understand your feelings and identify what you need to heal.

5. Practice Stress-Reducing Activities

Since chronic stress can affect several body systems, incorporating stress-management activities into your routine may support your overall well-being.

Consider:

Walking or engaging in regular physical activity.
Practicing deep breathing.
Getting enough quality sleep.
Spending time outdoors.
Practicing meditation or mindfulness.
Maintaining meaningful social connections.
Making time for activities that bring you joy.

These activities will not automatically eliminate resentment, but they can help you develop healthier ways of responding to emotional stress.

6. Consider Talking to a Mental Health Professional

Some experiences are too painful to process alone.

If resentment is affecting your sleep, relationships, mood, or daily activities, speaking with a therapist or counselor may help you understand your emotions and develop healthier coping strategies.

This can be particularly helpful when the experience involves betrayal, trauma, abuse, or prolonged emotional distress.

You do not have to force forgiveness before you are ready.

7. Understand That Forgiveness Is for Your Well-Being, Too

One of the biggest misconceptions about forgiveness is that it is something you do for the person who hurt you.

In reality, forgiveness can also be about reclaiming your emotional freedom.

You do not need someone else’s apology, acknowledgment, or permission to begin healing.

You can decide that what happened was wrong, recognize that it hurt you, and still choose to move forward.

That decision does not erase the past. It simply means the past does not have to determine your future.

Does Forgiving Someone Mean You Have to Reconcile With Them?

Absolutely not.

Forgiveness and reconciliation are two different things.

Forgiveness involves working toward releasing resentment and reducing the emotional control that a painful experience has over you.

Reconciliation involves rebuilding a relationship, which generally requires trust, accountability, changed behavior, and effort from both people.

You can forgive someone without contacting them again.

You can forgive someone without accepting an apology.

You can forgive someone while maintaining boundaries or choosing not to have them in your life.

This distinction is particularly important when dealing with emotional abuse, manipulation, betrayal, or repeated harmful behavior.

Your health and well-being should never depend on maintaining a relationship that puts you at risk.

Final Thoughts: Holding a Grudge May Hurt More Than You Realize

Holding a grudge may feel like a way of protecting yourself from someone who hurt you, but carrying unresolved anger for long periods can become another source of stress in your life. Research suggests that chronic anger and stress can affect your cardiovascular system, immune function, sleep, digestion, muscles, and mental well-being. Although a grudge does not automatically cause disease, the emotional burden associated with persistent resentment is worth taking seriously.

Remember, letting go does not mean forgetting what happened, excusing someone’s behavior, or allowing them back into your life. It means recognizing that you deserve peace, even if the person who hurt you never apologizes. You cannot rewrite the past, but you can take steps to protect your health, establish healthier boundaries, and create a future that is no longer controlled by someone else’s actions. Sometimes, one of the kindest things you can do for yourself is stop carrying the emotional weight of something you can no longer change.

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