What causes your blood pressure to rise suddenly?

Sudden rises in blood pressure can be triggered by several factors. Physical exertion, stress, and anxiety cause the body to release adrenaline, which temporarily constricts blood vessels and increases heart rate. Pain, fear, or emotional distress activate the same fight-or-flight response. Caffeine, certain medications like decongestants and NSAIDs, and stimulant drugs can spike pressure quickly. Smoking causes an immediate but temporary rise. Eating salty foods can raise it within hours, especially in salt-sensitive people. Sleep apnea, a full bladder, and cold temperatures also contribute. In more serious cases, a sudden severe spike called a hypertensive crisis can result from stopping blood pressure medication abruptly, kidney problems, or adrenal gland disorders.