splint even if the swelling in the thumb, knuckle and joint is not caused by a broken or cracked bone, it advisable to wear a splint for a day or two, so that the thumb is not aggravated by any unnecessary or sudden movement. In addition to a splint, you could also tie a bandage around your swollen thumb to reduce the swelling and to keep it. swollen joints happen when theres an increase of fluid in the tissues that surround the joints. Joint swelling is common with different types of arthritis, infections, and injuries. symptoms of arthritis in the thumb include swelling, pain, and stiffness at the basal (lower) thumb joint. Autoimmune diseases your bodys immune system is designed to fight foreign invaders. Thumb joint pain and inflammation can be the result of an injury or sprain to the thumb, or even some chronic disease like osteoarthritis. It is often accompanied by stiffness of the joint, and makes even simple activities like gripping or holding an object quite painful. injury to the thumb or hand, insect bites and stings and arthritis and osteoarthritis of small joints may lead to swelling thumb joint. It is essential to know the reason behind the swelling for the treatment of swollen thumb. causes of thumb joint pain thumb joint pain can be the result of a variety of different issues, ranging from injury to disease, and it could even be caused by the excessive use of modern technology. A swollen thumb may be painful and affect your day-to-day activities. Causes for a swollen thumb can arise from a bacterial infection within the nail, trauma from a injury that is affecting the thumb bones, or inflammation of the thumb joints. A sprained thumb and arthritis are the most common culprits for a swollen thumb. Read below for more information on causes and treatment options. causes of swollen thumb home remedies, treatment for thumb swelling having a swollen thumb will not only cause you discomfort, it also prohibits you from doing some of your regular daily activities.