Sinusitis, cold, and flu are all common respiratory conditions that can cause discomfort and affect our daily lives. While they share some similarities in terms of symptoms, they differ in their underlying causes and severity. Here's a brief overview of each condition:

Sinusitis: Sinusitis refers to the inflammation of the sinus cavities, which are the hollow spaces in the skull surrounding the nose. It can be caused by a viral, bacterial, or fungal infection, as well as allergies or structural issues in the nasal passage. Common symptoms of sinusitis include facial pain, nasal congestion, headache, thick nasal discharge, cough, and reduced sense of smell.

Cold: The common cold is a viral infection that primarily affects the upper respiratory tract. It is caused by various strains of viruses, most commonly rhinoviruses. Cold symptoms typically include a runny or stuffy nose, sneezing, sore throat, cough, mild fatigue, and occasionally low-grade fever.

Flu: Influenza, commonly known as the flu, is a highly contagious respiratory illness caused by influenza viruses. It can cause mild to severe symptoms and sometimes leads to complications, especially in vulnerable individuals. Flu symptoms often come on suddenly and may include high fever, headache, muscle and body aches, fatigue, sore throat, cough, and nasal congestion.