Depression can be defined as persistent sadness for weeks or months, rather than just a few days. It is being more than simply unhappy or fed up for a few days. Some of the common symptoms of depression are:

• Feelings of helplessness and hopelessness – A bleak outlook—nothing will ever get better and there’s nothing you can do to improve your situation.
• Loss of interest in daily activities. You don’t care anymore about former hobbies, pastimes, social activities, or sex. You’ve lost your ability to feel joy and pleasure.
• Appetite or weight changes. Significant weight loss or weight gain—a change of more than 5% of body weight in a month.
• Sleep changes. Either insomnia, especially waking in the early hours of the morning, or oversleeping.
• Anger or irritability. Feeling agitated, restless, or even violent. Your tolerance level is low, your temper short, and everything and everyone gets on your nerves.
• Loss of energy. Feeling fatigued, sluggish, and physically drained. Your whole body may feel heavy, and even small tasks are exhausting or take longer to complete.
• Self-loathing. Strong feelings of worthlessness or guilt. You harshly criticize yourself for perceived faults and mistakes.
• Reckless behavior. You engage in escapist behavior such as substance abuse, compulsive gambling, reckless driving, or dangerous sports.
• Concentration problems. Trouble focusing, making decisions, or remembering things.
• Unexplained aches and pains. An increase in physical complaints such as headaches, back pain, aching muscles, and stomach pain.