Signs of an allergy to aloe vera include irritated, red, or inflamed skin, a rash, or a burning sensation in the area where the aloe vera was applied. In addition to allergic reactions, aloe vera can cause other symptoms that are not necessarily the result of an allergy to aloe vera, but rather a side effect of ingesting it. Nausea, vomiting, and diarrhea can occur when aloe has been ingested, even in small amounts. When allergic reactions or gastrointestinal symptoms occur, a physician should be notified who may recommend treatment to reduce the effects.
An allergy to aloe vera can be quite serious in certain people. This usually occurs when aloe vera is injected or taken orally, rather than used as a topical preparation on the skin. Signs of a severe allergy to aloe vera include low blood sugar and electrolyte imbalance. Low blood sugar can cause dizziness, light-headedness, tremors, and sweating. Replenishing glucose stores with juice, candy, or table sugar can often raise blood sugar levels and eliminate symptoms.
People who have allergies to onions, garlic, or tulips may have a propensity for aloe vera allergy. Certain people who use topical aloe preparations for extended periods of time may develop an allergy to aloe vera that includes symptoms such as eczema and hives. As with many allergic skin reactions, treatment may include over-the-counter antihistamine medications. These medications, while effective in relieving inflammation and itching, can cause significant drowsiness, dizziness, and confusion. They should never be taken when driving or operating dangerous machinery is anticipated.
Aloe juice is sometimes taken to ease the effects of constipation. People should discuss this method of treating constipation with their GPs, who can advise them of side effects that can occur when consuming aloe juice. Drinking aloe for constipation can actually increase symptoms of abdominal cramps and bloating. Also, it can cause severe diarrhea, which if prolonged, can even lead to dehydration.
Although aloe vera is considered safe when added to commercial products like lotions and gels, consuming it in its raw form may not be wise. However, it is not considered harmful to use a small amount of aloe gel that has been extracted from the plant for burning or other minor skin irritation. Aloe gel should not be rubbed into large areas of skin and should never be applied to cuts or broken skin.