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How tall are you? How much do you weigh? Any weight change? Can you attach the photos here? Exactly what part of your left hand si swollen? Does anything make it better or worse? Numbness or tingling? Is it consistent? Is it getting worse? Any other symptoms? Are you aware of anything which might have triggered it? Any medical problems? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history?
Numbness or tingling? Exactly where is the pain in your left thumb? On a scale of 0-10, what is it with 0 being no pain and 10 being the strongest pain? Does anything make it better or worse? What is it like? Does it radiate to somewhere else? When you press the area, do you have pain? Can you move joints in your left thumb? Joint swelling? Warm joints? Joint redness?
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Are you taking any chronic medicines?