It can often be confused with Rhus tox and can also follow well and can be given if Rhus-tox has failed.
Rhododendron can be worse before a storm, during a storm and because of this they can often predict when a storm is coming along as they are sensitive to electric charges in the atmosphere..
They can also be worse for damp weather.
It is a remedy indicated for fibromyalgia type symptoms if the picture fits.
There can be stiffness and aching which is worse in the mornings and cracking in the joints. Symptoms can be better for hot baths, hot water generally and massage.