my son collapst outside (2nd times in two weeks) fell to floor grazed chin and jaw said he was aware his hands were flapping on the floor.  his knuckles were swollen red/purple in colour this morning as he has reins diseases.  what could cause him to collapse  -
Hello! Welcome on Chat Doctor ! His symptoms could be related to a cardiac arrhythmia or low blood pressure could cause such episode. Seizures, can not be excluded either, although he was aware of what was happening. For this reason, I would recommend consulting with his GP and performing some tests: - complete blood count for anemia- an EEG for seizures- a heart rhythm Holder monitoring coupled with a cardiac ultrasound to examine his heart and exclude possible cardiac arrhythmia-blood electrolytes for possible imbalance-thyroid hormone levels. Hope you will find this answer helpful! Best wishes, 