CHICAGO (CBS) — A wet May and a warm start to June have wreaked havoc on many allergy sufferers.

Typical pollen seasons are tree pollen season in March to May, grass pollens in May to June, and weeds and ragweeds in August to October.

Retired allergist Dr. Edward Leija said the grass and mold counts are particularly high these days.

“The main problem is the grass,” he said.

Leija said the summer likely will remain a rough one for those with allergies. The only way to combat the problem is to take allergy medication and stay inside as much as possible.

“They have to take their medicine on a regular basis, because the next few hours the pollen’s going to come back, and it’s going to take time for the medication to work,” he said.

The onset of summer heat releases more irritants that affect seasonal allergies.