Allergies are quite awful, but quite harmless. Inconvenient, but harmless. Sometimes, though, there are symptoms for other diseases that are often confused or misdiagnosed as allergies. Many people often confuse allergies for the common cold or even more serious ailments such as a sinus infection or bronchitis. Be informed of when should take some antihistamines and try to stop walking outside, or if you should be prepared for something worse. Here are 10 signs your allergies may be worse than you think.