In order to better understand some health issues my daughter is having, I ended up revisiting Reynaud's Syndrome (RS).
The mechanism for RS is associated with peripheral vasoconstriction (PV). There are various causes of PV, some quite normal.
Another condition that hikers get is "hyponatremia." I get severe hyponatremia when I hike in hot weather (lots of sweat) and drink straight water. My body over-responds to a slight imbalance in salt content, and rejects water. The best symptom to look for is urinating clear fluid all day, for me around 15 minutes after I drink water. The result is dehydration despite drinking plenty of water. I do not suffer from Reynaud's Syndrome. The cure for my hyponatremia during hiking is full-strength Gatorade or a similar water additive. Make sure the stuff you add to your water has real sugar, not one of the artificial sweeteners.
If you suffer from both Reynaud's syndrome AND hyponatremia, you should get a work-up from an endocrinologist to determine whether your body is secreting enough vasopressin. Vasopressin affects both PV and the excretion of "solute-free water." When you urinate clear fluid soon after drinking, your body may be over-excreting solute-free water due to a shortage of vasopressin.
I am not a doctor. Any corrections or additions are welcome.
-------------- Been lashed by the rain, stung by the sleet,
Had my tent blown in but I'm still on my feet
- With apologies to Lowell George
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