Feeling faint — also described in medicine as presyncope — is the sense of dizziness, weakness or near-loss of consciousness that can happen before a full faint. This page gives general information on likely causes, warning signs that need urgent attention, immediate self-care measures, and which medical specialties commonly assess this symptom.
People describe feeling faint as lightheadedness, a sensation that the surroundings ‘tilt’ or go dim, sweating, nausea, palpitations or a sudden wave of weakness. It’s a symptom, not a diagnosis: the same feeling can arise from many different underlying processes.
Frequent causes include a sudden drop in blood pressure on standing (orthostatic hypotension), dehydration, low blood sugar, vasovagal reflexes, and anxiety or panic. Cardiac causes such as arrhythmias or structural heart disease, infections, bleeding, and hormonal imbalances are other possibilities. Age, chronic illnesses and some medications can increase risk.
If the sensation is accompanied by chest pain, severe shortness of breath, loss of consciousness, repeated fainting, new neurological signs (weakness, difficulty speaking, confusion), or follows head injury, seek emergency medical evaluation promptly. These signs can indicate conditions that need immediate assessment.
If you feel faint, sit or lie down in a safe place and avoid sudden standing. Lying flat and raising the legs may help short-term. Medical assessment typically includes history and physical exam, blood pressure checks (including orthostatic measurements), heart rhythm tracing (ECG), and basic blood tests. These help narrow causes and decide on further testing.
Start with primary care or internal medicine for an initial evaluation. Depending on findings, referrals may be made to cardiology (heart rhythm or structural concerns), neurology (neurological causes), endocrinology (hormonal disorders), infectious diseases (if infection is suspected) or psychiatry (if anxiety or panic is a likely factor). Medication review is commonly part of the workup.
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