In addition to birth control, the hormonal IUD is used for prevention and treatment of:

Heavy menstrual periods
Endometriosis and chronic pelvic pain
Adenomyosis and dysmenorrhea
Anemia
Endometrial hyperplasia (especially in pre-menopausal women who wish to maintain fertility in the treatment of endometrial hyperplasia)
In some cases, use of a hormonal IUD may prevent a need for a hysterectomy.Advantages:

Considered one of the most effective forms of reversible birth control
Can be used while breastfeeding (see also nursing mothers)
No preparations needed before sex, though routine checking of the device strings by patient and physician is advised to ensure proper placement remains intact
90% of users who wish to become pregnant do so within 24 months of removal. May experience lighter periods (some women stop having periods completely, see also amenorrhea)
Effective for up to three to seven years (depending on the IUD)Disadvantages:

Irregular periods and spotting between periods often occurs after insertion This usually improves after three to six months. Moderate to severe discomfort may be experienced during insertion procedure, including uterine cramping and back pain. Other potential adverse effects and risks

Effectiveness
After insertion, Mirena is effective at preventing pregnancy for up to seven years. Kyleena is approved for five years and Skyla is approved for three years.The hormonal IUD is a long-acting reversible contraceptive, and is considered one of the most effective forms of birth control. The first year failure rate for the hormonal IUD is 0.1-0.2% and the five-year failure rate is 0.7-0.9%. These rates are comparable to tubal sterilization, but unlike sterilization the effects of the hormonal IUD are reversible.
The resulting biceps damage is the main cause of this classic physical position commonly called "waiters tip".If the injury occurs at age early enough to affect development (e.g. as a neonate or infant), it often leaves the patient with stunted growth in the affected arm with everything from the shoulder through to the fingertips smaller than the unaffected arm. This also leaves the patient with impaired muscular, nervous and circulatory development. The lack of muscular development leads to the arm being much weaker than the unaffected one, and less articulate, with many patients unable to lift the arm above shoulder height unaided, as well as leaving many with an elbow contracture.The lack of development to the circulatory system can leave the arm with almost no ability to regulate its temperature, which often proves problematic during winter months when it would need to be closely monitored to ensure that the temperature of the arm was not dropping too far below that of the rest of the body. However the damage to the circulatory system also leaves the arm with another problem. It reduces the healing ability of the skin, so that skin damage takes far longer than usual to heal, and infections in the arm can be quite common if cuts are not sterilized as soon as possible.The neurological damage is often the most problematic aspect of Erbs palsy, but it is also the most varying.