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2. Tachycardia - Wikipedia

   en.wikipedia.org/wiki/Tachycardia

   Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. [1] In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. [1] Heart rates above the resting rate may be normal (such as with exercise) or abnormal (such as with electrical problems within the heart).

3. Postural orthostatic tachycardia syndrome - Wikipedia

   en.wikipedia.org/wiki/Postural_orthostatic...

   Postural orthostatic tachycardia syndrome (POTS) is a condition characterized by an abnormally large increase in heart rate upon sitting up or standing. [1] POTS is a disorder of the autonomic nervous system that can lead to a variety of symptoms, [10] including lightheadedness, brain fog, blurred vision, weakness, fatigue, headaches, heart palpitations, exercise intolerance, nausea ...

4. Paroxysmal sympathetic hyperactivity - Wikipedia

   en.wikipedia.org/wiki/Paroxysmal_sympathetic...

   Paroxysmal sympathetic hyperactivity (PSH) is a syndrome that causes episodes of increased activity of the sympathetic nervous system.Hyperactivity of the sympathetic nervous system can manifest as increased heart rate, increased respiration, increased blood pressure, diaphoresis, and hyperthermia. [1]

5. What’s the Difference Between a Normal and Dangerous Heart Rate?

   www.aol.com/difference-between-normal-dangerous...

   High heart rates with associated symptoms such as chest tightness, palpitations or heart pounding/racing, fainting, dizziness, lightheadedness, shortness of breath, or fatigue, it may suggest an ...

6. Does your heart beat faster when you stand or sit up? Learn ...

   www.aol.com/does-heart-beat-faster-stand...

   The symptoms of Long COVID tend to mirror POTS because of prolonged fatigue, brain fog, dizziness, and rapid heart rate, among others. POTS is also commonly associated with (but not limited to ...

7. Normal Heart Rate for Elderly: What You Need to Know - AOL

   www.aol.com/normal-heart-rate-elderly-know...

   Although it’s normal for the heart rate to increase due to physical activity or stress, a resting heart rate that’s consistently higher or lower than usual may be a sign of heart problems or ...