The word you are looking for is "cervical", such as a cervical collar for a sprained neck, or a cervical roll (a neck pillow). Also, "C1, C2, etc." as in cervical 1, etc., for the names of the upper spinal discs. Nuchal refers to the nape of the neck.
nape
Nape
nape
The back of the neck is called the "nape."
The back of the neck is the nuchal region.
Faciocervical is the medical term meaning "pertaining to the neck and face."
Cervicalgia is the medical term for pain in the neck.
Pertaining to the head and neck: cephalic
Pertaining to the face: facial
Pertaining to the neck: cervical
The thyroid is the gland in the neck. Cervical lymph nodes are often called "glands" in error in lay language.
Paracervical is the medical term meaning pertainint to, near, or beside the neck.
Thoracocervical means pertaining to the chest and neck.
Clavicular
Poikiloderma is the medical term meaning sun damage to the neck.
The medical term for the neck of the uterus is the cervix.
Nuchal cord is the medical term meaning cord around the neck.
Nociception is the medical term meaning pain detection. -algia or -dynia is the medical terminology combining form meaning pain. The traditional Latin term meaning pain is dolor.
analgesic or painkillerAnother term for pain reliever is analgesicAnalgesicAnalgesic
Dorsalgia is the medical term meaning back pain. It is not a frequently used word.
Otalgia is the medical term meaning ear pain.
Stomatalgia is the medical term meaning mouth pain.
Mastodynia or mastalgia is the medical term meaning breast pain.
The medical term for stomach pain is gastralgia. The suffix for gastralgia is -algia, meaning "pain."
Gastroenteralgia is the medical term meaning pain in the stomach and intestine.
Adnexal is the medical term meaning near the ovary.