Everyone feels worried or anxious or down from time to time. But relatively few people develop a mental illness. What's the difference? A mental illness is a mental health condition that gets in the way of thinking, relating to others, and day-to-day function.Signs and symptoms of mental illness depend in part on the illness. Common symptoms includefeeling down for a whileextreme swings in moodwithdrawing from family, friends, or activitieslow energy or problems sleepingoften feeling angry, hostile, or violentfeeling paranoid, hearing voices, or having hallucinationsoften thinking about death or suicide.
In some people, symptoms of a mental illness first appear as physical problems such as stomach aches, back pain, or insomnia.
Individuals with a mental illness can often ease their symptoms and feel better by talking with a therapist and following a treatment plan that may or may not include medication,know more about  Mental Health