Irrational fear of diseases is common but irrationality can vary.

For some it could be a normal intimidation but for some it can be a persistent ordeal.

Like for any symptoms you experience, connect to a chronic life threatening disease that can harm you to a great degree.

This is a form of phobia often called a nosophobia.

Many records show that Covid 19 pandemic gave rise to many such cases as people became scared of catching a disease that can even take their lives.