Microwave - and other forms of electromagnetic - radiation are major (but conveniently disregarded, ignored, and overlooked) factors in many modern unexplained disease states. Insomnia, anxiety, vision problems, swollen lymph, headaches, extreme thirst, night sweats, fatigue, memory and concentration problems, muscle pain, weakened immunity, allergies, heart problems, and intestinal disturbances are all symptoms found in a disease process the Russians described in the 70's as Microwave Sickness.
For those who wonder if there are any health issues or problems from exposure to Smart Meters and the electromagnetic frequencies they emit, here is a short video which shows three samples of blood examined using a Darkfield Microscope.
The video is self-explanatory, as the samples clearly show morphological responses or reactions. That kind of constant exposure with apparent human cellular morphological reactions—as will happen when a Smart Meter is placed on a dwelling—undoubtedly occurs, as EMFs/RFs are emitted 24/7/365. Consequently, it will be only a matter of time, depending upon each individual’s electromagnetic sensitivities threshold, before adverse health consequences materialize.
Below is a chart created by EMF researcher Ronald M. Powell, PhD, which is self-explanatory? 
The above graphic shows that 67 peer-reviewed, repeated studies show significant health issues (e.g. cancer, tumors, infertility) at levels far below the government safety standards (gray line). The yellow line is what the standards should be if public safety is considered. Source
In another paper, “Electronicmagnetic Field Interactions With the Human Body: Observed Effects and Theories,” (NASA, April 1981) presented to the Goddard Space Flight Center, Greenbelt, Maryland 20771, on page 23, we find this:
Adverse, Benign, and Curious Effects
The effects listed and/or discussed in this section relate to at least three of the five senses (touch, hearing, and sight) and nearly every system of the human body (including circulatory, digestive, nervous, and muscular). Many of them are temporary; however, some result in death and persistent disease. Some are better understood and more widely accepted than others.  [CJF emphasis added]
In 1981, NASA knew of numerous health problems, which are now classified as “Non-Thermal Health Effects,” which were cited on page 30 of that report:
Disturbed sleep at night
Sleepiness in daytime
Feelings of fear
Pulling sensation in the scalp and brow
Loss of hair
Pain in muscles and heart region
Increased perspiration of extremities
Difficulty with sex life
And, on page 59 of that same report, this most enlightening comment appears:
Physical and Physiological Foundations
A great variety of theories have been developed to help understand the effects described in the preceding sections. In this section, the theories are presented roughly in order of how homogeneous the human body is assumed to be. At one extreme, it may be regarded as a simple shape (e.g. a prolate spheroid) with a single set of electromagnetic constants (permittivity, permeability, and conductivity). In that sense, the body is a simple antenna or probe capable of intercepting a certain amount of electromagnetic energy, which is converted entirely into heat. At the other extreme, the body may be regarded as a collection of countless electronic microcircuits, each one corresponding to an individual cell or part thereof. Electromagnetic energy somehow finds its way to individual microcircuits and influences the electronic functions there. These functions include various communication and control processes essential to life and its activities. [CJF emphasis added]
That the human body is “a collection of countless electronic microcircuits” seemingly is disregarded totally by those who should know better or catalog medical-science information, e.g., Public health agencies, states Public Utility Commissions and the various public utilities the PUCs regulate, whose mission statements often include “to provide safe services.” What’s “safe” about making people exposed to EMFs/RFs that cause health problems? Utilities are forcing EMF/RF-producing Smart Meters on to consumers’ and customers’ residences with total disregard, plus dis-abandon even for those who come under the Americans with Disabilities Act (ADA).
For bureaucrats at states’ public utility agencies and electric, natural gas, and water utility companies’ corporate executives and legal departments, here’s a quick primer on the human body being an electromagnetic entity, whose ‘wires’ get crossed when impacted by microwave EMFs and RFs.
Smart Meters pulsed-microwave-energies, which are sent into a home over its electrical wiring system, create what’s called “dirty electricity”, i.e., much higher Hz than the house electrical wiring is designed to handle. Here, though, is some information pertinent to pulsed electromagnetic fields (PEMFs):
PEMF stands for Pulsed ElectroMagnetic Fields, which are widely used these days to improve circulation and cell metabolism. The body can become accustomed to nonmoving (or static) magnetic fields, which are generally unable to deeply penetrate the body. A pulsed electromagnetic field, however, is quite dynamic, is able to penetrate all the way through the body, and creates a cascade of effects within the body.  [CJF emphasis added]
And, consider this, which is the all-important differential:
It is important to distinguish between the electromagnetic fields we use for [medical] therapeutic purposes, and other man-made electromagnetic fields from power lines, microwave ovens, cell phones, etc., which can cause damage to our bodies.  [CJF emphasis added]
Note that Smart Meters operate using microwave technology, the same high tech of cell phones and cell towers to transmit and receive information from utility companies 24/7/365 which produce very high EMF pulses every 15 seconds—per a meter test I personally observed—of every hour of every day of every week of every month of every year. You can turn off a cell phone, but you can’t turn off your electric, natural gas or water Smart Meter.
Lastly, here’s a tell-tale graphic of how microwave (cell phone/tower, Wi-Fi, and Smart Meters) EMFs affect children’s brains:
Children’s brains absorb much higher amounts of microwave radiation than adults because of their thinner skulls. Their nervous systems are also easily damaged by EMF because they do not yet have the protection afforded by nerve cell myelination. 
Catherine J Frompovich (website) is a retired natural nutritionist who earned advanced degrees in Nutrition and Holistic Health Sciences, Certification in Orthomolecular Theory and Practice plus Paralegal Studies. Her work has been published in national and airline magazines since the early 1980s. Catherine authored numerous books on health issues along with co-authoring papers and monographs with physicians, nurses, and holistic healthcare professionals. She has been a consumer healthcare researcher 35 years and counting.