Yes, allergies can make asthma worse especially if you have allergy induced asthma. Allergic asthma is triggered by an allergic reaction to allergens such as pollen or pet dander. You may find that your asthma is worse in the spring when there is an increase in flowering plants, while others find their asthma is worse in the late summer or early fall due to ragweed or mold from leaves on trees. These triggers can cause airway constriction, inflammation, and mucous production to become worse. Typical allergies cannot develop into asthma.