title: Is that mood change a sign of something more serious?  Irritability, sadness, or apathy may signal another condition.
mesh_terms: D057565:Apathy; D003863:Depression / Q000453:epidemiology; D004644:Emotions; D006801:Humans; D007508:Irritable Mood; D012890:Sleep; D013315:Stress, Psychological / Q000453:epidemiology