John has been having difficulties getting out of bed, is not interested in going out with friends, and hardly ever answers the phone. he has let a number of bills go unpaid, he is sleeping 12–14 hours a day, and he cannot concentrate at work. he has called in sick to work at least once each week. john is most likely suffering from disorder.

major depressive disorder

Explanation:

John is showing symptoms of major depressive disorder.

Major Depressive Disorder or major depression is characterized by a combination of symptoms that interferes with a person's ability to work, sleep, study, eat and enjoy pleasurable activities. Major Depression is debilitating and prevents the person from functioning normally. Some people may have only one episode in a lifetime, but most often they have multiple episodes.

Depression is common, but it is a very serious disease. Most depression sufferers need treatment to improve.

the endocrine system secretes hormones into blood and other body fluids. these chemicals are important for metabolism, growth, water and mineral balance, and the response to stress. hormones provide feedback to the brain to affect neural processing. reproductive hormones affect the development of the nervous system.