In one sentence, describe what the following article is about:

Some over-the-counter medications can help ease catarrh. Decongestants, antihistamines, and steroid nasal sprays can help with catarrh that does not improve with home treatment.  Do not use over-the-counter medications without consulting a pharmacist, especially if you have health conditions or are taking existing mediations. Some medications are not safe for everyone. You can also try Mucinex to help thin out mucus. Make sure to drink lots of water along with the medication. Usually, catarrh will pass on its own without treatment. However, long lasting catarrh can become difficult to live with. Your catarrh is intense and does not respond to treatment, make an appointment with your doctor. You may have an underlying condition that needs to be addressed. Catarrh can be caused by conditions such as nasal polyps or allergies. If your doctor suspects one of these conditions is causing catarrh, you may be referred to a specialist for evaluation.  You may have to undergo an allergy test to rule out allergies. Treatment depends on the cause of your catarrh. Nasal polyps, for example, may be treated with nasal sprays that contain steroids. Sometimes, the cause of chronic catarrh is unclear. If your doctor cannot find a clear cause, they may advise you on specific self-help techniques. These techniques will be specific to you and your conditions. Go over self-help techniques with your doctor and ask any questions you have. You want to follow your doctor's instructions carefully to help treat catarrh.

Summary:
Ask a pharmacist about over-the-counter medications. See a doctor under certain conditions. Rule out and treat underlying conditions. Ask your doctor about self-help techniques.