Millions of Americans suffer from allergies and residents of Northcentral Wisconsin are already feeling the effects.

Doctors say allergies are caused by an oversensitive immune system. When the body detects an allergen it produces an antibody that causes a chemical release such as a histamine

Doctors say now that trees are starting to bud it's a sure sign that allergy season is here.

If a runny nose and itchy eyes are bothering you, doctors say over-the-counter anti-histamines and nasal spray offer the best relief. However if those make you drowsy or do not offer enough relief, doctors say they can prescribe stronger medications.