Forearm Pain (Lower Arm) Causes – Muscles, Bones, Joints, Nerves

What is forearm pain?

Forearm pain is any discomfort, soreness or pain in the part of the arm lying between the elbow and wrist. It may occur on its own or be present with arm pain as a whole, elbow pain, wrist pain, hand and finger pain. The pain may only be present when moving the forearm, hands or fingers since many of the muscles of these neighboring parts are located within the forearm. Alternatively, the pain may be present and persist even when the forearm is stationary. Sometimes forearm pain is not due to any problem within the forearm or neighboring structures. Instead it emanates from the root of the spinal nerve with pain been felt along the course of the nerve down the upper arm and forearm to the hands and fingers.

Forearm anatomy

It is important to first understand the anatomy of the forearm as any disease, disorder or injury of these structures may be the reason for forearm pain.


The forearm is the area that lies between the elbow and the wrist. It has two long bones known as the ulna and the radius. Both these bones are a joined by a thin but very strong interosseus membrane. That radius and ulna have a long body called the shaft with the head of the ulnar lying towards the wrist and the head of the radius located at the elbow.


There are several joints – between the radius and ulna and between these bones and the humerus in the elbow or the carpal bones at the wrist. This allows for the degree of flexibility in the forearm where it is able to twist inwards or outwards in movements known as pronation and supination and the bending and straightening of the forearm known as extension and flexion. The radius and ulna articulate with each other at two points – the proximal radioulnar joint (PRUJ) and the distal radioulnar joint (DRUJ). Various ligaments serve to hold the bones and structures of these joints in place thereby adding strength and support.

Muscles and tendons

The forearm is primarily composed of muscles and its tendons. The muscles can therefore be divided into two compartments –an anterior or (front) compartment and a posterior (rear) compartment. Within these compartments, lie the muscles of the forearm that allow for :

  • Flexion and extension of the hand and digits
  • Pronation and supination of the forearm

The groups of muscles that therefore carry out these movements are therefore known as the flexors, extensors, pronators and supinators. Long tendons running as far down as to the digits allows for the different movements of the hand and fingers despite the muscles being located in the forearm.


Three important nerves run through the forearm supplying the skin and muscles of the forearm and also innervating parts of the hand and fingers. These nerves are the :

  • Median nerve
  • Ulnar nerve
  • Radial nerve

Blood vessels

Vessels in the forearm which supplies its with blood and also supplies the hand and fingers. This includes the radial and ulnar arteries and of the cephalic, median antebrachial and basilica veins. Alongside these blood vessels lie the lymphatic vessels and lymph nodes.

Causes of forearm pain

The video below provides an overview of the assessment of forearm pain by a medical practitioner in an attempt to diagnose a possible cause.


Injury to the forearm is one of the most common causes of pain. It may soft tissue injury isolated to the skin, subcutaneous fat and superficial muscles or extend deeper to the deep muscles of the forearm and involved the bone The upper limbs, particularly the forearm, hands and fingers are the most exposed and active parts of the body. It is also more prone to injury related to trauma or overuse. This may arise with :

  • Falls either striking the ulnar and radius directly or use the hands to break a fall.
  • Twisting the arm beyond its normal range of motion.
  • Blow to the forearm in instances of accidents or falls.
  • Sharp force injury which may sometimes be defensive wounds when the forearm is used to shield the body.

In instances where the force of the injury is severe enough, it may cause a fracture of the bone. Either the radius or ulna may be fractured or sometime both bones together which is then known as a radioulnar fracture. Some of the common sites of a fracture include the shafts of both bones, head of the radius and olecranon of the ulna involved in the elbow joint.

Overuse and strain

Overuse of the forearm and strain on structures may also need to pain, where they involves the joints if, bones, muscles and tendons or ligaments. The more important of these conditions that lead to forearm pain includes :

  • Tenosynovitis is the inflammation of the tendon sheath. It is more likely to occur in the forearm since some of the longest tendons start here and extend all the way to the finger.
  • Medial epicondylitis is inflammation of the tendons that attach to the medical epicondyle of the humerus at the elbow. It is commonly known as golfer’s elbow.
  • Lateral epicondylitis (tennis elbow) is inflammation of the tendons that attach to the lateral epicondyle of the humerus.


Although there are several different types of arthritis which can affect almost any joint in the body, it is osteoarthritis there is most likely to lead to forearm pain. In this type of arthritis, the articular cartilage at the end of the bone becomes eroded over the time usually as a result of wear and tear. This erosion may eventually expose the underlying bone which can then become damaged.

  • Osteoarthritis of the elbow is one of the possible causes of the forearm pain as well as osteoarthritis of the hand.
  • Rheumatoid arthritis may be seen in the wrist and in the small joints of the fingers.
  • Septic arthritis can affect any joint if microbes enter the joint space usually after an injury with a break in the skin.

Nerve Problems

Neuropathy or nerve disorders may also cause forearm pain even in the absence of any injury or disease of the other structures within the forearm. Those nerve conditions that are more likely to lead to forearm pain include :

  • Cervical neuropathy is any disorder in the cervical spinal nerves. The more common causes are nerve root compression (pinched nerve). It can cause referred pain to the arm, forearm, hands or fingers. It is usually when C5 and C6 or C6 and C7 are affected that forearm pain may be present.
  • Carpal tunnel syndrome is where the median nerve becomes compressed on its way from the forearm to the hand as a result of inflammation of the tendons running through the carpal tunnel. It mainly causes wrist, hand and finger pain with varying degrees of forearm pain at times.
  • Ulnar neuropathy is a term for any problem with the ulnar nerves. The two more common causes apart from nerve damage with an injury to the forearm includes ulnar tunnel syndrome at the wrist and ulnar nerve entrapment at the elbow. It is the latter, ulnar nerve entrapment at the elbow, that is more likely to cause forearm pain while ulnar tunnel syndrome may present with wrist, hand and finger pain.

Blood Vessel Problems

Although problems with the blood vessels leading to forearm pain is uncommon compared to the disorders with the other structures mentioned above, it should be taken into consideration.

  • Peripheral embolism is where a blood clot (or any other tissue or object in the blood vessel) partially or completely obstructs the blood flow to the forearm, hand or fingers.
  • Acute limb ischemia is damage to the tissue of the forearm as a result of an interruption to the blood supply. It is more likely to occur with a blood clot or tourniquet that is left in place for long periods of time.
  • Narrowing of the brachial artery or its branches (radial and ulnar artery) may also compromised blood flow to the arm thereby leading to ischemia.
  • Thrombophlebitis is an inflammation of the blood vessel of the forearm usually due to an infection which may occur after an injury with a break in the skin or the use of unsterilized needles.
  • Lymphangitis which is an inflammation of the lymphatic vessel may also lead to localized forearm pain and tenderness with a red streak on the overlying skin where the vessel lies.

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  • bobbye nothngel

    I was trying to wake board and something pulled in my forearms that has caused weakness in my hands and soreness on the inside of my forearms. Can you advise me on any relief techniques and if this could be a tear and need medical attention or just soreness.

  • Guinivere

    Every morning is when my arms hurt the most. I’m not sure if I keep my arms drawn up and bent during sleep or what, but when I straighten them out and stretch, they really ache. Growing old sucks. 🙁

  • Brandon Korhn

    My forearm is only sore close to my elbow on the bottom side, wondering if there’s any self treatment for this. I’m 16.

    • Hi Brandon. It is difficult to advise on a treatment without knowing the exact cause of this soreness. Overuse of the arm, like with playing a sport involving the arms as well as any repetitive or prolonged actions like holding up an object to the face (a book or a mobile device) could cause strain of the tendons and even pinch the nerve running in the area. Resting the arms would often relieve the soreness for a while. It is advisable that you have this checked by a doctor.

  • Sasha Lopez

    im having this very horrible blunt pain in the bone on my forearm ,it just happened this morning when i woke up and keeps happening on and off not sure what is going on what could be wrong and should i be concerned ,i also just noticed there is a slight indentation in the tissue above the part of the bone that hurts thats not on the other arm

    • Hi Sasha. Hopefully you have sought medical advice for this pain. It can be difficult to identify the cause of the pain without any other symptoms. It can also be difficult to identify that it is coming from the bone as you mention. There are many causes of forearm pain as you can see from the article above. It is advisable that you speak to your doctor if they pain is persisting. Having it properly assessed by a doctor helps with reaching the final diagnosis as well as the appropriate treatment.

  • Jj Wing

    I’m 28 and I had shingles last year. 2 days ago I started feeling pain on the inside of my forearm. It only hurts with touch. Is this nerve damage? It’s on the same side as my shingles rash.

    • Hi JJ. It could be a recurrence but it could also be an entirely different condition apart from your shingles. Herpetic neuralgia, a complication of shingles, is unlikely to affect the area that you describe but it is a possibility. There is nevertheless a possibility that your shingles is recurring. You have to consult with your doctor and possibly follow up with a specialist like a neurologist.

  • Susan White

    I recently started having throbbing pain in my forearm on my left hand. It is between my elbow and my wrist. It throbs when it is stationary and when I have to move my arm. I have been working as a bank teller for 10 plus years so I am wondering if it just carpal tunnel.

    • Hi Susan. While carpal tunnel syndrome is a possibility, there are other conditions that may also need to be considered, such as ulnar neuritis or tennis elbow (lateral epicondylitis). All of these conditions (including carap tunnel) need to be assessed by a medical professional and treated where necessary. Sometimes this may simply mean resting your arm, using a wrist or elbow support brace or using a more ergonomic keyboard and so on. The sooner you have this assessed and treated, the better the outcome. Speak to your doctor as soon as possible.