Hi, submandibular lymph nodes swollen on left for 1 week approx 1 cm. They have decreased. Now lump in back of throat. Post-nasal, occasional cough?

Symptoms of a cold. Taken together your symptoms are likely those of a upper respiratory virus (common cold). Lymph nodes in the head and neck can become swollen with a cold. Some of these nodes are adjacent to the submandibular salivary glands, which in turn may become infected and swollen. If indeed all due to a viral cold your symptoms should resolve without treatment in the next 5-10 days. http://bit.ly/1OiIRcI.