What causes sudden fainting when getting up at night to go to the bathroom?

Generally, fainting upon getting up at night to use the bathroom may be caused by conditions such as micturition syncope, arrhythmia, or cerebral infarction. Patients can manage these conditions through lifestyle improvements, medication, and other treatments.

1. Micturition Syncope: This condition is usually triggered by rushing to urinate during the night, excessive straining while urinating, or autonomic nervous system dysfunction. Patients often experience dizziness or lightheadedness after urination, which may lead to fainting. Treatment typically involves medications such as atropine sulfate tablets or racemic anisodamine tablets, as directed by a physician. It is advisable to move slowly when getting up at night to use the bathroom, and having someone accompany the patient is recommended.

2. Arrhythmia: Arrhythmia may be related to endocrine imbalances, nervous system disorders, and other factors. It is commonly accompanied by symptoms such as shortness of breath, dizziness, and loss of consciousness, which could result in sudden fainting when getting up at night. Patients should follow medical advice and take prescribed medications such as furosemide tablets or aspirin tablets.

3. Cerebral Infarction: Cerebral infarction is generally caused by factors like large-artery atherosclerosis or cerebral artery stenosis. During an episode, patients may suddenly lose consciousness, develop hemiplegia, or experience impaired awareness, leading to fainting when rising at night. Immediate medical attention is essential, and treatment under a doctor's supervision may include medications such as clopidogrel hydrogen sulfate tablets or aspirin tablets.