The document discusses different types of neck swellings, their potential causes, investigations, and management. Some potential causes of neck swellings include enlarged lymph nodes due to infections, tumors, cystic hygromas in children, and enlarged thyroid or parotid glands. Differential diagnoses depend on the location of the swelling. Investigations may include ultrasound, biopsy, or FNAC. Definitive treatment is based on determining the nature of the swelling.