here is some information I found.
Relationship conflict can be a significant source of stress. When the conflict in your relationship is ongoing, it creates stress that can negatively affect the health and well-being of both you and your friend. Here are a few ways that conflicts in a relationship can affect you physically and mentally.
What Is Relationship Conflict?
Relationship conflict is a disagreement between people (e.g., partners, friends, siblings, or co-workers). The root of the conflict might be something like a difference of opinion, experience, taste, perspective, personality, or beliefs.
Conflict is generally intense enough to disrupt some aspect of the relationship, such as communication, which is what differentiates it from simply having a different point of view. It's not just romantic partners who can experience conflicted relationships—families can also be in conflict.
Whether it’s an open debate over dinner or an underlying feeling of discomfort that remains unspoken, family conflict can cause a significant amount of stress. It might be that there's no lack of love between members, but rather, a lack of comfort in dealing with conflict.
You can experience conflict in any type of relationship you have, be it with your partner, parent, sibling, child, friend, or even a co-worker.
While it can be difficult and uncomfortable, conflict in a relationship is not always a bad thing. When it is healthy and productive, relationship conflict presents an opportunity for people to learn about how others see and experience the world. It can also generate creative solutions to problems and help people grow.
However, when conflict is not productive or healthy, it can be harmful to everyone involved. Sustained, unresolved conflict can create tension at home or at work, can erode the strength and satisfaction of relationships, and can even make people feel physically sick or in pain.
Conflicted Relationships and Your Health
Research has shown that relationship conflict can negatively affect your health. In one study, "stable negative social exchanges" (in other words, repetitive or prolonged conflict) were significantly associated with lower self-rated health, greater functional limitations, and a higher number of health conditions.5
One key takeaway is that stress can negatively affect your immunity, which puts you at greater risk of illness.
Exposure to conflict can make you more susceptible to infectious illnesses like colds and the flu. Some people also experience chronic pain related to stress, such as headaches and back or neck pain.
Conditions Associated With Chronic Stress
If your stress levels are not managed, it can put you at an increased risk for developing stress-influenced physical and mental health conditions, such as:
Acne
Anxiety disorders
Burnout
Depression
Diabetes
Digestive issues (such as diarrhea, constipation, ulcers)
Hair loss
Heart disease
Hyperthyroidism
Insomnia
Obesity
Sexual dysfunction
Tooth and gum disease
Conflict and Physical Pain
Those country songs about the pain of a broken heart might actually be backed up by science. Takotsubo cardiomyopathy (also known as stress cardiomyopathy or "broken heart syndrome") is triggered by extreme and sudden emotional trauma or physical stress.
All relationships experience conflict from time to time. Some of the most common causes of conflicted relationships include:
Problematic behaviors
Communication issues
Disagreements about leisure time
Intimacy issues
Division of labor
Conflicts over children and parenting
Finances
Jealousy
Trust issues