Nicotine withdrawal is a group of symptoms that occur in the first few weeks after stopping or decreasing use of nicotine. Symptoms include intense cravings for nicotine, anger or irritability, anxiety, depression, impatience, trouble sleeping, restlessness, hunger or weight gain, and difficulty concentrating. Withdrawal symptoms make it harder to quit nicotine products, and most methods for quitting smoking involve reducing nicotine withdrawal. Quit smoking programs can make it easier to quit. Nicotine withdrawal is recognized in both the American Psychiatric Association Diagnostic and Statistical Manual and the WHO International Classification of Diseases. Signs and symptoms
The most documented symptoms of nicotine withdrawal are cravings for nicotine, anger or irritability, anxiety, depression, impatience, trouble sleeping, restlessness (psychomotor agitation, including indeliberate movement), hunger or weight gain, and difficulty concentrating. Symptoms are usually strongest for the first few days and then dissipate over 2–4 weeks. The most common symptoms are irritability, anxiety, and difficulty concentrating. Depression and insomnia are the least common. Other withdrawal symptoms may include anhedonia, constipation, cough, decreased positive affect, dizziness, drowsiness, headache, impulsivity, fatigue, flu symptoms, mood swings, mouth ulcers, and increased dreaming. Cessation of nicotine can also require changes in levels of various medications. Definition
Nicotine withdrawal refers to the effects that nicotine-dependent individuals experience after they discontinue or decrease nicotine use. Nicotine is an addictive substance found most commonly in tobacco and tobacco products including cigarettes, cigars, chewing tobacco, e-cigarette liquid, pipe tobacco, snus, snuff, and nicotine medications such as nicotine gum.
Low-level laser therapy has been shown to reduce pain immediately after treatment in acute neck pain and up to 22 weeks after completion of treatment in patients that experience chronic neck pain. Low quality evidence suggests that cognitive-behavioural therapy may be effective at reducing pain in the short-term. Massaging the area may provide immediate and short-lived benefits, but long term effects are unknown. There is a lack of high-quality evidence to support the use of mechanical traction, and side effects include headaches, nausea and injury to tissue. Radiofrequency denervation may provide temporary relief for specific affected areas in the neck. Transcutaneous electrical nerve stimulation (TENS), the noninvasive use of electrical stimulation on the skin, is of unclear benefit in chronic neck pain. Epidemiology
Neck pain affects about 330 million people globally as of 2010 (4.9% of the population). It is more common in women (5.7%) than men (3.9%). It is less common than low back pain. Prognosis
About one-half of episodes resolve within one year and around 10% become chronic. Prevention
Prevalence of neck pain in the population suggests it is a common condition. For cervicalgia associated with bad posture the treatment is usually corrective in nature (i.e. ensure shoulders are in one line above the hips) and relating to interventions that provide ergonomic improvement. There is also growing research in how neck pain caused by mobile devices (see iHunch) can be prevented using embedded warning systems. References
External links

6 Ways to Ease Neck Pain - Harvard Medical School
Neck pain - Symptoms and causes - Mayo Clinic