Summary: Health problems caused by inflammation of the mouth and throat are among the most frequently reported symptoms in primary care. The symptoms of stomatitis vary depending on the cause, but determining the exact etiology can be challenging. Common symptoms include pain, swelling, redness, blisters, ulceration, erosion, and difficulty swallowing, biting, or chewing food. Stomatitis can significantly impact daily life, making it difficult to eat, drink, brush teeth, or even speak. As a result, patients often seek over-the-counter treatments for relief. There are numerous preparations available on the market, each with different compositions and mechanisms of action. These treatments commonly include non-steroidal anti-inflammatory drugs (NSAIDs), local anesthetics, herbal or natural substances, and antibacterial agents. The most effective products should be easy to use, reach all affected areas, and deliver the active ingredient directly to the site of inflammation. Topical preparations are particularly beneficial as they help reduce the risk of systemic side effects associated with NSAIDs. A commonly used treatment in Poland is a 0.074% diclofenac solution, known for its strong pharmacological properties. This formulation effectively reaches inflamed areas in the mouth and throat, where it accumulates, enhancing its anti-inflammatory and analgesic effects. Unlike oral medications, it carries a lower risk of systemic side effects, making it a preferred option for local symptom relief.