Hello Thank you for trusting HCM Dear have you had any history of allergy?? Laughing is nothing but one type of exercise which will induce hyperventilation can cause trigger allergy or asthmatic symptoms. Laughing may cause rapid deep inspiration of pollen, dust and allergen may cause nasal congestion. If you living in cold environments that may cause rapid inhalation of cold air can cause allergic rhinitis cause congestion. Please avoid allergen, use water vapor inhalation, use tab. Moterleukast and levocegrizine at night time, if your symptoms not improved consult your doctor he will examine and treat you accordingly.