Symptoms of a cucumber allergy can range from mildly inconvenient to potentially life threatening. In most cases, those who are allergic to cucumbers have mild local symptoms such as redness around the mouth, skin reactions, or itchy, watery eyes. Sometimes gastrointestinal symptoms such as nausea or stomach pain may occur as a result of consuming this food. In the most severe cases, the face and throat may swell so much that breathing becomes difficult or even impossible. Any specific questions or concerns about a possible cucumber allergy should be discussed with a doctor or other medical professional.

A medical condition known as oral allergy syndrome is the most common presentation of a cucumber allergy. When the raw cucumber touches the face or is eaten, a red rash may surround the mouth or even develop inside the mouth. This rash often causes itching or discomfort. Itchy, watery eyes, runny nose, and sneezing may also occur. As the cucumber is related to ragweed, those with an allergy to ragweed carry a higher risk of developing a cucumber allergy.

A cucumber allergy is also closely related to a latex allergy. For this reason, those who are allergic to latex may be advised to avoid cucumber consumption. Many people who exhibit an allergy to cucumbers may also be allergic to foods such as melons or bananas. When any of these foods are peeled or cooked, the risks of experiencing allergic symptoms are diminished.

Skin reactions are relatively common signs of a cucumber allergy. Some people may break out into an itchy rash when a product containing cucumber touches the skin. Many cosmetic products contain cucumber as an ingredient, so those with this type of allergy should read labels carefully. When the cucumber is eaten, a rash may develop all over the body. This rash may present as hives or have more of an eczema-type appearance.

More severe symptoms of a cucumber allergy may include extreme nausea or stomach pain. In some cases, blood pressure may drop to dangerous levels. If these symptoms are accompanied by black or bloody vomit or diarrhea, a doctor should be consulted immediately. Anaphylaxis is a medical term used to describe a severe and potentially fatal type of allergic reaction that may cause symptoms such as chest pain, difficulty breathing, or facial swelling. If this condition is not treated immediately, permanent brain damage or even death is possible within a matter of minutes.