Conditions and Diseases
Back Neck and Spine

What can cause lumps on back of your head and neck that just appeared over night and are kinda of tender?

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Wiki User
2007-07-09 22:20:38

It could be inflamed lymph nodes which are part of you immune

system. Thus, your body may be fighting bacteria and are causing

your lymph nodes to overwork and become larger.

There's a large concentration of lymph nodes on the back of ones

neck, under the armpits, in the groin area, etc.

Please see your primary care physician to have them checked to rule

out any potential problems.

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