Symptoms

• Seasonal allergy symptoms include runny nose, itchy or watery eyes and nasal congestion.
  
  

Causes

• Allergies are caused by the immune system overreacting to a harmless substance and producing histamines. Common triggers of seasonal allergies include pollen and mold.
  
  

Sinus Infections

• Seasonal allergies do not cause fevers on their own, but chronic sinus congestion can lead to a bacterial sinus infection (sinusitis), which can cause fever---as well as symptoms such as nasal congestion, sinus pressure, headache and cough.
  
  

Colds

• If what appears to be seasonal allergies causes general aches and pains, cough and sore throat, and a fever, it may actually be the common cold, a viral infection.
  
  

Treatment

• Treatment for seasonal allergies include antihistamines, decongestants and allergy shots. If you have a fever, consult your doctor, as you may need antibiotics to treat a sinus infection.