Pain in upper right arm between elbow and shoulder can annoy and trouble us a lot. The upper arm is the most often used parts of the body. From mundane activities to vital actions, it supports many activities in the daily life. So, it is common to experience pain in different parts of the arm that stretches from shoulder to fingers.
What Can Cause Right Sided Underarm Pain?
Underarm Pain Causes – Left, Right, Breast, & Sharp Shooting Pain under Armpit - American Celiac
There are many possible causes of armpit or underarm pain referred to medically as axillary pain that can range from mostly a nuisance to serious. Irritation from deodorant, infections in the sweat glands, injuries, nerve compression, or even cancer are only a few of the possibilities. Pain may occur alone or be associated with a rash, swollen lymph nodes, or other signs. Diagnosis often begins with a careful history and physical exam, but blood tests and imaging tests may be needed to determine the cause and figure out the best treatment. Even when armpit pain is accompanied by enlarged lymph nodes in the axilla, breast cancer that has spread is not the most common cause.
Elbow and arm pain
The elbow is the visible joint between the upper and lower parts of the arm. It includes prominent landmarks such as the olecranon , the elbow pit , the lateral and medial epicondyles , and the elbow joint. The elbow joint  is the synovial hinge joint  between the humerus in the upper arm and the radius and ulna in the forearm which allows the forearm and hand to be moved towards and away from the body. Medical Subject Headings defines the elbow specifically for humans and other primates,  though the term is frequently used for the anterior joints of other mammals, such as dogs. The name for the elbow in Latin is cubitus , and so the word cubital is used in some elbow-related terms, as in cubital nodes for example.
In human anatomy , the wrist is variously defined as 1 the carpus or carpal bones, the complex of eight bones forming the proximal skeletal segment of the hand ;   2 the wrist joint or radiocarpal joint , the joint between the radius and the carpus  and; 3 the anatomical region surrounding the carpus including the distal parts of the bones of the forearm and the proximal parts of the metacarpus or five metacarpal bones and the series of joints between these bones, thus referred to as wrist joints. As a consequence of these various definitions, fractures to the carpal bones are referred to as carpal fractures, while fractures such as distal radius fracture are often considered fractures to the wrist. The distal radioulnar joint is a pivot joint located between the bones of the forearm , the radius and ulna. Formed by the head of the ulna and the ulnar notch of the radius , this joint is separated from the radiocarpal joint by an articular disk lying between the radius and the styloid process of the ulna. The capsule of the joint is lax and extends from the inferior sacciform recess to the ulnar shaft.