A dry cough that lasts for more than a few weeks can happen for several reasons. Often it starts after a viral infection and takes time to settle. Other common causes include allergies, mucus dripping from the nose into the throat, asthma, acid reflux, and side effects of some blood pressure medicines. In certain cases, ongoing infections such as tuberculosis or exposure to smoke, dust, or air pollution may also be responsible. Because the cough is not improving with treatment, it is important to consult her doctor, who may examine her chest and suggest tests, such as a chest X-ray, breathing tests, or blood tests to identify the exact cause. Treatment will depend on the underlying cause of the cough. Allergy-related cough may improve with antihistamines or nasal sprays, asthma needs inhalers, and acid reflux can be managed with diet changes and acid-reducing medicines. If a medicine is causing it, the doctor may switch it. Avoiding irritants like smoke and dust can also help. Warm drinks, steam inhalation, and good hydration may provide some comfort. If there are warning signs such as fever, weight loss, breathlessness, or blood in the cough, please seek medical attention promptly.