Yestrday woke up with a spider bite in my upper arm. painful thing as day went one lump grew. overnight lump has shrunk but pain has spread to elbow.

See doctor : May just be the gland in the elbow becoming stimulated by the bite (reactive epitrochlear node) but safest is to have it looked at to check no infection or other more serious bite reaction. Recommend be seen for examination. Or if in the Waikato you can virtual consult on here if you wish

Spider bite: It's best to have a physician check your arm because of spreading pain. Other worrisome symptoms would include spreading redness, fever,chills, abdominal discomfort or swelling of the bite site.

Infection: There could be the risk of an infection developing at the site of the bite. You can try anti-inflammatories but if the pain does not resolve, see your doctor as you may need antibiotics