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- Tachycardia (Grubb, 2000)
- Lightheadedness (Grubb, 2000)
- Dizziness (Grubb, 2000)
- Palpitations (Grubb, 2000)
- Exercise intolerance (Grubb, 2000)
- Blurred Vision (Grubb, 2000)
- Chest discomfort and/or pain (Grubb, 2000)
- Clamminess (Grubb, 2000)
- Fainting or near fainting (Grubb, 2000)
- Anxiety (Grubb, 2000)
- Flushing (Grubb, 2000)
- Fatigue (Grubb, 2000) (which can be disabling)
- Headache/migraine (Grubb, 2000)
- Shortness of breath (Grubb, 2000)
- Postprandial hypotension (Grubb, 2000) (low blood pressure after meals)
- Blood pooling in limbs (Grubb, 2000) (can make legs feel heavy and appear mottled and purple in color)
- Intolerance to heat (Grubb & Karas, 1999)
- Feeling cold all over (Grubb & Karas, 1999)
- Low blood pressure upon standing (Grubb, Kosinski, Boehm & Kip, 1997) (Some physicians feel orthostatic hypotension is a separate entity from POTS)
- Bloating after meals (Grubb et al., 1997)
- Cognitive impairment (Grubb et al., 1997) (may include difficulties with concentration, brain fog, memory and/or word recall)
- Delayed gastric emptying (Grubb et al., 1997)
- Polyuria (Jacob & Biaggioni, 1999) (excessive urination)
- Diarrhea (Jacob & Biaggioni, 1999) (sometimes with alternating Constipation)
- Narrowing of upright pulse pressure (Jacob & Biaggioni, 1999)
- Tremulousness (Low, Opffer-Gehrking, Textor, Benarroch, Shen, Schondorf, Suarez & Rummans, 1995)
- Tunnel vision (Low et al.)
- Sleep disorders (Low et al.) (can cause unrefreshing sleep and an increased need for sleep)
- Cold hands (Low et al.) (and often feet & nose)
- Loss of sweating (Low et al.)
- Hypovolemia (Low et al.) (low blood volume)
- Chills (Low et al.)
- High blood pressure (Low et al.)
- Hyperventilation (Low et al.)
- Numbness or tingling sensations (Low et al.)
- Generalized weakness (Low et al.)
- Reduced pulse pressure upon standing (Low et al.)
- Low Back pain (Mathias, 2000)
- Aching neck and shoulders (Mathias, 2000)
- Excessive sweating (Robertson, 2000)
- Nausea (Robertson, 2000)
- Noise sensitivity (Stewart, 2001)
- Light Sensitivity (Stewart, 2001)
- Disequalibrium (Sandroni, Opfer-Gehrking, McPhee & Low, 1999)