Convulsions are mainly characterized by the patient falling to the ground, non-stop contraction of limb muscles (i.e., involuntary twitching of the limbs), twitching of the facial muscles, foaming at the mouth, dyspnea, or even breath-holding, and so on. The patient’s consciousness during convulsions may or may not be clear, depending on the cause of the convulsions. Convulsions due to brain causes are mostly unconscious and may be accompanied by squinting and rolling of the eyes, incontinence, foaming at the mouth, and breathlessness or breath-holding. Convulsions due to muscle spasms (e.g., after calcium deficiency, after strenuous exercise) are accompanied by significant muscle pain and are often not accompanied by impaired consciousness. If the convulsions stop quickly, you should seek medical attention afterwards. If severe convulsions occur, you should call 120, and you should also prevent choking, limb injuries, and so on.