It is possible that taking cold medicine may affect the rise in blood pressure because cold medicine contains ephedrine and acetaminophen, which can cause peripheral vasoconstriction, thus causing a rise in blood pressure. However, there is no direct relationship between cold and elevated blood pressure. The cause of hypertension is often due to lack of exercise, irregular work and rest, and unbalanced nutrition. During a cold, it causes nasal congestion, headache and dizziness, resulting in capillary constriction causing cerebral vasospasm, which affects blood circulation and causes blood pressure to rise. If the blood pressure returns to normal when the cold improves, there is no need for special treatment. If the blood pressure does not recover after 1 week of getting better from the cold, it is possible that the elevated blood pressure is not due to the cold, but may be primary hypertension or secondary hypertension caused by other reasons, so you should go to the hospital promptly and determine the cause.