Anaphylaxis symptoms usually occur within minutes of exposure to an allergen. Sometimes, however, anaphylaxis can occur a half-hour or longer after exposure. In rare cases, anaphylaxis may be delayed for hours.

Understanding the Context

Signs and symptoms include: Skin reactions, including hives and itching and flushed or pale skin Low blood pressure (hypotension) Constriction of the airways and a swollen tongue or ... Low blood pressure (hypotension) is commonly overlooked because it may cause no symptoms, or its symptoms could be present in other conditions. Blood pressure is the force exerted by blood on artery ... Some early symptoms can cause discomfort or loss of energy, including: Extreme tiredness, also called fatigue.

Key Insights

Dizziness or fainting when standing after sitting or lying down. This is due to a type of low blood pressure called postural hypotension. Sweating due to low blood sugar, also called hypoglycemia. Upset stomach, diarrhea or vomiting. Serotonin syndrome symptoms usually occur within several hours of taking a new drug or increasing the dose of a drug you're already taking.

Final Thoughts

Signs and symptoms include: Agitation or restlessness Insomnia Confusion Rapid heart rate and high blood pressure Dilated pupils Loss of muscle coordination or twitching muscles High blood pressure Muscle rigidity Heavy sweating Diarrhea Headache Shivering ... MSN: 10 Symptoms That Could Mean Your Blood Pressure Is Too Low Orthostatic hypotension, also called postural hypotension. This is a sudden drop in blood pressure when standing up after sitting or lying down. Causes include dehydration, long-term bed rest, pregnancy, certain medical conditions and some medicines. This type of low blood pressure is common in older adults. Postprandial hypotension.

Orthostatic hypotension โ€” also called postural hypotension โ€” is a form of low blood pressure that happens when standing after sitting or lying down. Orthostatic hypotension can cause dizziness or lightheadedness and possibly fainting. Low blood pressure without symptoms or with only mild symptoms rarely requires treatment. If low blood pressure causes symptoms, the treatment depends on the cause.