Ultrasound (USG) is a scanning technique done with the use of high-frequency sound waves to produce images of structures inside the human body. It is an imaging method that offers vital information for diagnosing and treating underlying diseases and medical conditions. While most of the ultrasound investigations are done using an ultrasound device outside your body, in some cases the device is placed inside the body. Despite certain limitations, it is a valuable tool. It is done in case of gallbladder disease, infections, muscle abnormalities, thyroid gland evaluation, foetus assessment, breast lump, or diagnosis of cancer. Considered a safe procedure with low-power sound waves, there are no risks involved. After undergoing ultrasound, return to normal activities is immediate. A radiologist analyses the images and sends a report to the doctor.