What are hives?

Skin rash. That is characteristically raised, evanscent, and itchy.
A vascular reaction. Hives are slightly elevated patches of skin caused by increased blood flow. The hives are usually caused by histamine release, which dilates blood vessels and causes the resultant edema. The hives are usually surrounded by a red halo - a flare - which comes from a reactive skin flush. The irritated nerve endings in the vicinity of the hive will send off "itching" signals.
Hives. Hives: http://www. Webmd. Com/skin-problems-and-treatments/guide/hives-urticaria-angioedema#1.

Related Questions

What are hives?

Itchy, red, raised. Hives are itchy, red, raised lesions on the skin and they usually happen after contact with or ingestion of something you're allergic to. Try some benadryl, (diphenhydramine) cold packs, and see your doctor if they get worse!
Itchy welts. Hives are welts. They are raised, "blotchy", red, and itchy. They can be of variable size. They usually come and go and last a few minutes to a few hours at a time.
Itchy bumps. Hives are raised lesions/welts that are raised and can be variable in size. There are many causes of hives and these include infections, medications, bee/wasp stings, food allergies, environmental allergies, amongst other rarer causes. Oftentimes, hives are idiopathic, meaning there is no known cause. For further evaluation and management, referral to a board-certified allergist is recommended.
Hives. Hives: http://www. Webmd. Com/skin-problems-and-treatments/guide/hives-urticaria-angioedema#1.

What causes hives?

Mast Cells. A special type of white blood cell (bodily defense system) called a mast cell contains the chemical histamine. When it is released in the and around the skin it causes the local swelling and itching we call hives or urticaria. This release of histamine can be caused by lots things like allergies, cold, exercise and even exposure to sunlight.
Broad answer. The causes of hives is very broad: foods, medications, other medical conditions to name a few. A detailed history is required to elucidate the cause of hives. It is not unusual to not find a cause of hives.
Many causes. There are many causes of hives and these include infections, medications, bee/wasp stings, food allergies, environmental allergies, stress, cold temperatures, and exercise amongst other rarer causes. Oftentimes, hives are idiopathic, meaning there is no known cause. For further evaluation and management, consultation with a board-certified allergist is recommended for evaluation and management.

What causes hives?

Usually allergic rxn. Usually it is caused by an allergic reaction, like contacting something you're allergic to touch. Consult your physician. Wishing you the best.
Histamine release. Mast cell histamine release cause blood vessels to leak resulting in localized swelling (the bump of hives) & sensory nerves to fire giving the sensation or itching. These nerves trigger a local nerve reflex that increases blood flow (the redness of hives). Hives lasting <6 weeks are usually due to viral infection or allergy to foods or drugs. When >6weeks cause is may autoimmune or benign.
Many causes. There are many causes of hives and these include infections, medications, bee/wasp stings, food allergies, environmental allergies, stress, cold temperatures, and exercise amongst other rarer causes. Oftentimes, hives are idiopathic, meaning no known cause. For further evaluation and management, consultation with a board-certified allergist is recommended.

What causes hives?

Everything. There are numerous things that will cause hives. Water, heat, cold, sun, drugs, infection are just a few.
Anything. Just about anything and everything can cause hives. Despite this we never determine the cause in many cases of chronic hives. Treatment is the main approach. For many people the hives eventually go away.

Can you tell me what can hives look like?

Raised, red, itchy. Hives appear like welts. They are very itchy, raised, red, and oval to round in shape. They can wax and wane and even coalesce together. They can occur on any part of the body. They are warm to the touch and blanch when pressed. They can resolve and leave the skin perfectly normal appearing.

What are hives and how do they look like?

Allergic reaction. Hives, or urticaria, are typically red, itchy, and perhaps swollen or raised areas of skin that are often an allergic reaction to something (a food, bug bite, or medicine, etc). Treatment is usually to stop the medicine or avoid the food. Antihistamines (benadryl, claritin) are often helpful. In more severe cases, steroids can be used.
See Below. Hives are raised reddish ithcy spots that appear more red on the edges and more pale in the center. They can occur anywhere on the body and one individual spot does not normally last for more than 24 hours. See picture.

What causes hives... I have had them for 3 days now...

Allergy. Most common is an allergy to something you swallowed or touched. Medications, foods, detergents, insect bites, perfumes. Try antihistamines for few days, if not better see your dictor or an allergist.
Many Things. Hives can be caused by viral infections, allergies including food allergies, airborne allergies, or stress. In some studies up to 50% of patients with chronic hives (greater than 4 weeks) had no identifiable cause. If your symptoms don't improve see your doctor or an allergist for help.

What are hives really? How does the body make them go away or shrink away?

Leaky vessels. Hives are caused by the activation of cells that release histamine and other inflammatory mediators that cause fluid to leak into surrounding tissue. These inflammatory mediators will be broken down by your body and will dissipate. Your body also makes Epinephrine (adrenaline) that can help stop the leakage.
Hives. More rarely they can be a part of hereditary respose involving the complement system and do not itch generally in that case.