People with<unk>  experience both depressive phases and hypomanic phases (which are less severe than a full manic episode). The depressive and manic symptoms in<unk>  last for variable amounts of time due to the unstable and reactive nature of the disorder. The depressive phases are similar to major depressive disorder and are characterized by dulled thoughts and sensations and the lack of motivation for intellectual or social activities. Most people with<unk>  are generally fatigued and tend to sleep frequently and for long periods of time. However, other people experience insomnia. Other symptoms of<unk>  depression include indifference toward people or activities that used to be extremely important.<unk>  depression also leads to difficulty making decisions. In addition, people with this condition tend to be critical and complain easily. Suicidal thoughts are common, even in mild forms of<unk> . In the depressive state, people with<unk>  also experience physical complaints including frequent headaches, tightness in the head and chest, an empty sensation in the head, weakness, weight loss, and hair loss. The distinguishing factor between typical depression and<unk>  depression is that in<unk>  depression, there are instances of hypomania. People with<unk>  can switch from the depressive state to the hypomanic state without warning to them or others. The duration and frequency of phases is unpredictable. In the hypomanic state, people's thoughts become faster and they become more sociable and talkative. They may engage in spending sprees, spontaneous actions, have heightened self-esteem, and greater vanity. In contrast to a regular manic state that would be associated with bipolar I, symptoms in the hypomanic phase generally occur in a less severe form.<unk>  commonly occurs in conjunction with other disorders. Between 20-50 percent of people with depression, anxiety, and related disorders also have<unk> . When people with<unk>  seek mental health resources it tends to be for symptoms of their comorbid condition rather than for their symptoms of<unk> . In children and adolescents, the most common comorbidities with<unk>  are anxiety disorders, impulse control issues, eating disorders, and ADHD. In adults,<unk>  also tends to be comorbid with impulse control issues. Sensation-seeking behaviors occur in hypomanic states. These often include gambling and compulsive sexuality in men, or compulsive buying and binge eating in women. In addition to sensation-related disorders,<unk>  has also been associated with atypical depression. In one study, a connection was found between interpersonal sensitivity, mood reactivity (i.e., responding to actual or potential positive events with brighter mood), and<unk>  mood swings, all of which are symptoms of atypical depression.<unk>  also tends to occur in conjunction with separation anxiety, where a person has anxiety as a result of separation from a caregiver, friend, or loved one. Other issues that tend to co-occur with<unk>  include social anxiety, fear of rejection and a tendency toward hostility to those connected with past pain and rejection. People with<unk>  tend to seek intense interpersonal relationships when in a hypomanic state and isolation when in a depressed state. This generally leads to short, tumultuous relationships.
Cyclothymia
Substance use disorder
Dysthymia
Borderline personality disorder
Euthymia 
Bipolar disorder
Congenital athymia
Myokymia