<unk>  is temporary loss of consciousness and posture. It most often occurs when the blood pressure is too low and the heart does not pump a normal supply of oxygen to the brain. Usual causes of<unk>  include cardiovascular diseases, stroke or transient ischemic attack, vasovagal response or orthostatic hypotension. Signs and symptoms include loss of consciousness, light-headedness, dizziness, feeling unsteady or weak when standing, even falling. It is important to identify the cause of<unk> . Many patients may recover after several minutes to hours. Once recover, the patient should be sent to hospital to confirm the causes of his/her<unk> . Usual tests include cardiac enzymes level, echocardiography, electrocardiogram, head images such as CT and MRI. Tilt table test may be helpful for vasovagal<unk> . Treatment and prognosis of<unk>  depends on the underlying causes.<unk>  caused by cardiovascular diseases may be life-threatening. Outcomes of most vasovagal<unk>  patients may be relatively better.
Syncope
Presyncope
Laryngospasm
Apnea
Bronchospasm
Sleep paralysis
Chest pain  
Chest pain