A report released by a Norwegian Expert Committee says there is no scientific evidence that low-level electromagnetic field exposure from mobile phones causes adverse health effects. The group found no evidence that the low-level fields around mobile phones and other transmitters increase the risk of cancer, impair male fertility, cause other reproductive damage, or lead to other diseases and adverse health effects, such as changes to the endocrine and immune systems. Since there are no uncertainties in the health risk assessment of low-level electromagnetic fields that warrant introduction of the precautionary principle, the Committee believes that general caution is sufficient. This means that exposure should not be higher than needed to achieve the intended purpose. In addition, the Committee also provides advice to authorities about risk management and regulatory practice in the report.