An apparatus (200) for diagnosing asthma is disclosed. The apparatus (200) comprises a data acquisition module (210) configured to acquire at least one physical deformation feature associated with at least one of nasal flaring, neck retraction and inter-coastal retraction of a subject under examination and an analysis module (220) configured to analyze the acquired at least one physical deformation feature associated with at least one of the nasal flaring, the neck retraction and the inter-coastal retraction of the subject under examination and diagnose the asthma based on the analyzed at least one physical deformation feature associated with at least one of the nasal flaring, the neck retraction and the inter-coastal retraction of the subject under examination. The disclosed apparatus (200) can be used for monitoring asthma at home, at hospital or in ambulatory patients.