• sunlover51 sunlover51
    November 12, 2008
    How long do symptoms from allergies typically last?
    sunlover51 sunlover51
    November 12, 2008

    I think I am having an allergic reaction to crab. How long do the hives last? From the reaction I have them all up my arms and on my back, and they still itch.



This question has not been answered by one of our experts yet.


  • andigirl2000 November 16, 2008
    November 16, 2008

    I have had hives last for days. You should see a doc and get a prescription for steroids. Shellfish is one of those potentially life threatening allergens, with each reaction possibly being worse than the last.

  • Janine January 02, 2009
    January 02, 2009

    I have an allergy to just crab and even with the smallest amount i get itchy and break out in hives. For me, it depends on the amount of crab that i have eaten. The smallest amount brings on a reaction, but the more amount of crab i consume the worse the itching and the hives become. One time i had a bite of crab and had a reaction for 2-3 days. The next week I had the same amount again (don't ask me why) and my reaction was worse. I was burning, itchy and covered in hives for a week. Everything swelled up and I couldnt even put on shoes. So I would say it depends on the amount you had consumed.

  • James Leary August 08, 2014
    James Leary
    August 08, 2014
    sunlover51,   You don't say how long you have had them, but yes, hives can last for several days.  I know it has been a while since you posted, but how long did they last?  Did you ever find any relief?  As other community members have said, allergies to shellfish can be very serioues, and shellfish are hidden in a lot of foods.  I am not a doctor and can't diagnose you here, so I would suggest that you check in with your physician if it happens again or if they persist.   If you did find some relief, please return to let us know how you are doing and how long they lasted.   Best of luck! James   Food Allergies: A Case of Mistaken Identity Oral Allergy Syndrome or Pollen Food Allergy - The Facts Reading Food Labels with Food Allergies   READ MORE
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