Ultrasonography (US) is a useful diagnostic method that can be easily applied to identify the cause of metatarsalgia. The superficial location of the structures, dynamic capability and direct real-time evaluation of the pain site are also strong advantages of US when we examine the foot with it. Moreover, knowing the possible pain sources to look at when the patient has a specific site of pain will enhance the diagnostic quality of the US, and will help the radiologists to perform an efficient and effective US.The purpose of this article is to review the common etiologies of metatarsalgia including Morton's neuroma, plantar plate injury, synovitis, tenosynovitis, bursitis and metatarsal fractures, and to discuss their US features.