Angioedema
Angioedema is similar to hives but these raised swellings are deeper than merely on the surface of the skin, but in the deeper layers. Angioedema is an allergic reaction. Some of the causes for angioedema are certain foods like eggs, berries and nuts, animal dander, medicine allergies and pollen. In angioedema, there is rapid swelling just below the surface of the skin; usualy around the eyes and lips. These welts can be painful and may be accompanied by breathing difficulties and abdominal cramps. When they occur in the airways, the situation can be a medical emergency. Typically antihistamines or anti-inflammatory medicines are prescribed.
Heriditary angioedema: Genetically passed
Allergic angioedema: Reaction to an allergen
Drug-induced angioedema: Side effect to a medication
Idiopathic angioedema: Without any known trigger.
Hives
Hives or urticaria is red itchy spots that appear on the skin, their bump-like appearance being the reason for the given name. They usually occur when a person develops an allergy to a drug, insect sting or food item. Infections or stress may also lead to the condition due to the release of certain chemicals such as histamine or mast in the body. Histamine is released when the body is in contact with toxins or pollen. This is a common condition that usually occurs in individuals who are more prone to allergies.
Normally hives lasts about one to two days and in this duration it may change rapidly in size and location by the hour. It may appear to have completed receded, only to quickly reappear in another spot. Hives may be accompanied by a deeper swelling known as angioedema and may also appear in mucous membranes, the eyes and lips.
Chronic urticaria lasts about six weeks and in about 80% of the cases cannot be traced to any allergic reaction. Urticaria may cause difficulty in breathing and shock but this occurs only in rare cases and hives hardly leads to life threatening situations. Hives affects 15 to 20% of the population at some time in the course of their lives. Acute hives in children may be caused due to a viral infection.
Stress hives
It is said that having hives may lead to stress, but stress does not lead to hives. However some studies show that emotional stress may cause hives, as do extreme hot or cold weather conditions. Chronic stress and tension may cause hives, so it is important to find ways to relax and take some time off your normal routine. Stress affects the immune system and may indirectly lead to hives especially when it persists for a long period of time. Stress is known to affect the hormonal balance and the body chemistry leading to hives.
Hives usually recedes by itself without any serious implications. In severe conditions, drugs or injections may be prescribed. Only in rare cases where a swelling blocks the airway and prevents the person from breathing properly, would it be described as an emergency.
Chemosis
The conjunctiva is the thin, transparent tissue that lines the eyelids and surface of the eye. The swelling of conjunctiva is termed as chemosis. The swelling is due to accumulation of fluid. Due to the swelling, the eyes cannot close properly and affects visual acuity. Chemosis is alternatively referred to as fluid-filled conjunctiva, swollen eye or conjunctiva.
The most common symptom associated with chemosis is swelling of the eye and the eye appearing red in color. In most of the cases, chemosis is caused by an allergic reaction, viral infection as well as by rubbing of the eye. Exophthalmos, a sign of hyperthyroidism, which results in abnormal bulging of one or both eyes, may also be associated with Chemosis.
Treatment of chemosis depends on its cause. Home care treatment options of chemosis due to angioedema or allergies includes using over-the-counter antihistmine medications and placing cool clothes on the eyes. It is best to contact health care provider in case the symptoms continue. The health care provider may diagnose by conducting a physical examination of the eye. Certain questions to understand the history of swelling of the eye and discomfort it causes will be asked. The health care provider will then prescribe an eye cream to reduce the swelling and antibiotics medications.
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