Symptoms may be absent or mild for the early onset of EAH and can include impaired exercise performance, nausea, vomiting, headache, bloating, and swelling of hands, legs, and feet.[4] As water retention increases, weight gain may also occur.[2] More severe symptoms include pulmonary edema and hyponatremic encephalopathy.[5] Symptoms of hyponatremic encephalopathy are associated with an altered level of consciousness and can include sullenness, sleepiness, withdrawing from social interaction, photophobia, and seizures.[4]