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Diseases & Conditions Healthy Lifestyle Your Health Look It Up
Diseases and Conditions
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Diseases And Conditions
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Ask the Doc Q&A
For how long is someone with a common cold contagious?
For how long is someone with a common cold contagious?
htmASKTHEDOCcommoncoldhowlongcontagious
Researchers have identified over 200 different viruses that that cause the common cold. The biggest offender is the rhinovirus. It causes up to 40% of colds. So that makes it hard to speak of the common cold as one specific illness. Rather, it is a collection of symptoms that are easy for doctors and patients alike to recognize:
1466231
InteliHealth
2012-12-17
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Howard LeWine, M.D.
2015-12-17
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Ask The Expert
Harvard Medical School
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Archive By Date: Ask the Doc Q&A
Page 1 of 4
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Answered questions from the past 2 years:
May 17, 2013
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I am an 87 year-old man. For some time I have been getting purplish-red splotches on my arms. I take a baby aspirin for heart disease. One doctor told me to stop because the aspirin could be causing the red splotches. But another said stopping could be dangerous. What do you say?
May 16, 2013
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My systolic blood pressure is 40 points higher in winter than in the summer (160–180 versus 120–140 mm Hg). Do the seasons affect blood pressure?
May 15, 2013
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When I walk for about a mile, my leg muscles suddenly get very weak — so weak I can hardly walk. After 10–15 minutes of rest, the muscles go back to normal and I can continue for another mile or so. I am trying magnesium pills. Is there anything else you suggest?
May 13, 2013
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My older sister passed away from a ruptured brain aneurysm several months ago. She was just 33. As far as I know, no one else in the family has a brain aneurysm. Do I and other close relatives need to be checked?
May 10, 2013
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My CRP was 4 in April and rose to 5 in June. My most recent LDL cholesterol was 125 mg/dL. What can I do to lower my CRP?
May 09, 2013
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I have hemachromatosis caused by excess iron in my body. To get rid of the iron, I get a pint of blood removed every 6 months. At my most recent bloodletting, a clot formed in the vein at the spot in my forearm where the needle was. Do I need to worry about this? Am I at risk for other clots and a stroke? Should I continue the bloodletting?
May 08, 2013
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My doctor just prescribed atorvastatin (Lipitor) for high cholesterol. The instructions said: “Do not eat grapefruit or drink grapefruit juice while taking this medication.” I love grapefruit. Do I need to avoid it completely?
May 07, 2013
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Do violent video games cause violent behavior?
May 06, 2013
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My wife wants me to get more exercise. I play golf three or four times a week when weather permits. I think that’s enough. Who is right?
May 03, 2013
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I am a 67-year-old man and, except for high blood pressure, my health is excellent. Since I retired earlier this year, I’ve started to enjoy an afternoon nap. But I don’t know if napping is good for me. What’s your view?

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