The symptoms of salivary gland diseases depend on the disease developed. Salivary gland stones cause painful lump in the affected gland. Eating may aggravate pain. Sialadenitis causes painless lump in the neck, a bad smelling discharge of pus from the duct into the mouth, and in severe cases it can cause fever, chills and general weakness. Viral infections can cause fever, headache, muscle and joint pain, malaise and poor appetite. Cysts are usually painless but sometimes they grow to an extent that they interfere with eating. Tumors both cancerous and non-cancerous grow slowly and can sometimes be painful. Sjögren's syndrome cause dry eyes, dry mouth and swelling of the salivary glands. Mumps is a viral infection that cause swelling of the parotid glands. It usually affects children and is now very much controlled by vaccine.