What is dysthymia? something like sad?

More like depression: Dysthymia is a mood disorder consisting of chronic depression, with less severe but longer lasting (2 years or more) symptoms than major depressive disorder.

Dysthymia ; SAD: (seasonal affective disorder). Dysthymia tends occur more often than not over at least 2 yrs. Sad occurs during colder months of the year. A person w dysthymia often feels low ; /or guilty, is self- critical, tired, lacks joy, is disinterested in activities, has trouble making decisions ; focusing ; is irritable/ angry. Self esteem is poor mixed w hopelessness ; problems w sleep ; /or appetite.

Dysthymia: Dysthymia, is a chronic type of depression that doesn't waver all that much in terms of intensity, as opposed to major depression which wavers widely in intensity. Metaphorically speaking, those with dysthymia experience it as having to wear a coat made of lead, 24-7, with little variation. Those with major depression experience the depressive lows almost like waves.