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  2. Palpitations - Wikipedia

    en.wikipedia.org/wiki/Palpitations

    Palpitations occur when a person becomes aware of their heartbeat. The heartbeat may feel hard, fast, or uneven in their chest. [1] [2] Symptoms include a very fast or irregular heartbeat. Palpitations are a sensory symptom. [1] They are often described as a skipped beat, a rapid flutter, or a pounding in the chest or neck. [1] [2]

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

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

    The most common symptoms of POTS are rapid heart rate within 10 minutes of standing or sitting up, lightheadedness and fainting, fatigue, brain fog, nausea, and shortness of breath.

  4. Hypnic jerk - Wikipedia

    en.wikipedia.org/wiki/Hypnic_jerk

    The causes of hypnic jerk are yet unclear and under study. None of the several theories that have attempted to explain it have been fully accepted. [ 9 ] One hypothesis posits that the hypnic jerk is a form of reflex , initiated in response to normal bodily events during the lead-up to the first stages of sleep, including a decrease in blood ...

  5. Sense of impending doom - Wikipedia

    en.wikipedia.org/wiki/Sense_of_impending_doom

    A sense of impending doom is a medical symptom that consists of an intense feeling that something life-threatening or tragic is about to occur, despite no apparent danger. Causes can be either psychological or physiological. Psychological causes can include an anxiety disorder, depression, panic disorder, or bipolar disorder.

  6. Paroxysmal nocturnal dyspnoea - Wikipedia

    en.wikipedia.org/wiki/Paroxysmal_nocturnal_dyspnoea

    The most common causes of dyspnea are cardiac (cardiac asthma) [10] and pulmonary conditions, like congestive heart failure with preserved ejection fraction, COPD, or pneumonia. [9] Less commonly, some cases of dyspnea can be attributed to neuromuscular diseases of the chest wall or anxiety.

  7. Reflex syncope - Wikipedia

    en.wikipedia.org/wiki/Reflex_syncope

    Episodes of vasovagal syncope are typically recurrent and usually occur when the predisposed person is exposed to a specific trigger. Before losing consciousness, the individual frequently experiences early signs or symptoms such as lightheadedness, nausea, the feeling of being extremely hot or cold (accompanied by sweating), ringing in the ears, an uncomfortable feeling in the heart, fuzzy ...

  8. 11 Reasons Why You May Feel Sick After You Eat ... - AOL

    www.aol.com/lifestyle/always-nauseous-eating-why...

    Nausea after eating can be a symptom of many conditions, like ulcers, acid reflux, anxiety, and more. Doctors explain what can make you feel sick after eating. 11 Reasons Why You May Feel Sick ...

  9. Orthostatic hypotension - Wikipedia

    en.wikipedia.org/wiki/Orthostatic_hypotension

    Generalized weakness or tiredness may also occur. Some also report difficulty concentrating, blurred vision, tremulousness, vertigo, anxiety, palpitations (awareness of the heartbeat), unsteadiness, feeling sweaty or clammy, and sometimes nausea. A person may look pale. [12]