Taking high blood pressure medication does not usually cause mouth ulcers. Taking antihypertensive drugs generally does not affect the oral mucosa, and will not lead to mucosal destruction, and there is no great correlation between antihypertensive drugs and mouth ulcers, so taking antihypertensive drugs generally does not cause mouth ulcers. However, the side effects of antihypertensive drugs are also more, some patients taking antihypertensive drugs for a long time may have panic, chest tightness, fatigue and other symptoms, and in serious cases may cause dry throat, body swelling, but generally will not cause mouth ulcers. If mouth ulcers are found during the period of taking antihypertensive drugs, they may be caused by other reasons, such as repeated failure to heal, it is recommended to consult a doctor in time.