 Symptoms of ADHD such as low mood and poor self @-@ image , mood swings , and irritability can be confused with dysthymia , <unk> or bipolar disorder as well as with borderline personality disorder . Some symptoms that are due to anxiety disorders , antisocial personality disorder , developmental disabilities or mental retardation or the effects of substance abuse such as intoxication and withdrawal can overlap with some ADHD . These disorders can also sometimes occur along with ADHD . Medical conditions which can cause ADHD type symptoms include : hyperthyroidism , seizure disorder , lead toxicity , hearing deficits , hepatic disease , sleep apnea , drug interactions , untreated celiac disease , and head injury . 
