Depending on the cause of the hypotension, it can be categorized as postural hypotension, postprandial hypotension, hypotension due to central nervous system disorders and drug-induced hypotension. 1. Postural hypotension: This is a sudden drop in blood pressure that occurs after standing up quickly from a lying or sitting position, and is caused by the inability to distribute sufficient blood properly. 2. Postprandial hypotension: This drop in blood pressure occurs 1 to 2 hours after eating, probably due to the concentration of blood in the stomach during the digestive process, resulting in insufficient blood volume throughout the body, and is most likely to affect the elderly. 3. Central nervous system disorders: Diseases such as Parkinson’s disease affect the way the nervous system controls blood pressure. People who suffer from low blood pressure as a result of such disorders are more likely to experience low blood pressure after eating. 4. Drug-induced hypotension: Certain medications can cause low blood pressure, such as medications for high blood pressure (hydrochlorothiazide, furosemide, indapamide, etc.), erectile dysfunction (androgens, testosterone undecanoate, etc.), and antidepressants (amitriptyline, doxepin, promethazine). If symptoms of unexplained low blood pressure appear, you need to go to the hospital as soon as possible, and the doctor will formulate an individualized diagnosis and treatment plan according to the specific condition.