In many families, there is a pattern of ASD or related disabilities, suggesting that there is a genetic basis to the disorder. There is some tendency for ASD to cluster in families with the incidence rate amongst siblings 50 times that of the general population.

this time RPC is not believed to be hereditary, however there are several families with documented and diagnosed RPC in them. Siblings are the most commonly found grouping, although several twins only one twin developed RPC. The next factor seen is parent and child, then grandparent and child.

There appears to be a predisposition based on heredity for some people when they are exposed to loud sounds, but whether or not tinnitus is genetically indicated is not certain. Scientists working on the Human Genome Project, for example, have not discovered a "tinnitus gene," but they have identified genes that are responsible for a few rare varieties of hearing loss, temporomandibular joint (TMJ) dysfunction, Ménière's Disease, and acoustic Neuroma.

Hereditary hemochromatosis is a genetic disease that is the result of inheriting two defective copies of a particular gene, one from each parent. The mutation in this gene causes the intestine to absorb too much iron. Over time, usually several years, this excess iron is deposited in the cells of the liver, heart, pancreas, joints, and pituitary gland. If left untreated, organ damage can result.

Hereditary Angioedema (HAE) is a very rare and potentially life threatening genetic condition that occurs in about 1/10,000 to 1/50,000 people. HAE symptoms include episodes of edema (swelling) in various body parts including the hands, feet, face, and airway. In addition, patients often have bouts of excruciating abdominal pain, nausea, and vomiting that is caused by swelling in the intestinal wall. Airway swelling is particularly dangerous and can lead to death by asphyxiation.

Heredity does seem to play a role. Ten percent of lupus patients have a first-degree relative (sister, daughter, son, mother) or a second-degree relative (aunt, uncle, first cousin) with lupus. Therefore, 90 percent of lupus patients DO NOT have relatives with lupus. Even in identical twins, when one sibling has lupus and the other twin does not, it is believed there are environmental factors that play an important role.

Each of us is the result of genes inherited from our parents, and the influence of our environment on the functioning of the genes and body components encoded in our genes. Sometimes an error occurs during replication of genes as part of the reproductive process. Most of the errors are analogous to typos in printed text - a single wrong character appears in an instruction in a gene. The defective gene results in the production of a faulty component for the body.

No, hammertoes and bunions are caused by pathomechanics, although shoe gear can aggravate the symptoms that can cause these problems.

Research indicates that genetic factors may play a part in causing autism in some individuals. Most researchers agree that autism probably results from many separate causes.

The role of mercury as a risk factor for childhood autism is not fully understood; however, it has been shown that mercury can interfere with the signaling pathways in a child’s developing brain and the modulation of proteins that regulate the immune system (see Understanding Mercury, Understanding Autism by Ellen Silbergeld, Ph.D., and Jennifer Nyland, Ph.D.).

Findings indicate that many children with autism or those who are at risk of developing autism have a metabolic impairment that reduces their ability to rid their bodies of heavy metals and other toxins. Build-up of these toxins in the body can lead to brain and nervous system damage and developmental delays (see We’re Loaded with Toxins: Analyzing the Toxic Body Burden of Americans by Judy Chinitz Gorman).

Some children who are genetically at risk for ASD may be more susceptible to the adverse effects of pesticide exposure. Research shows that several genes associated with autism risk encode for proteins that regulate excitation/inhibition within the central nervous system. Several of these neurotransmitter systems are known to be targets of pesticides frequently found in children (see Can Exposure to Environmental Toxicants Influence Autism Susceptibility? by Isaac N. Pessah, Ph.D.).

Autoimmunity is a condition in which the immune system attacks the body’s own tissues. Several studies show that autoimmune activity can be associated with ASD in some cases, but it has not been determined if this activity contributes to the development of the disorder or if it is a consequence of the disease (see Autism Spectrum Disorders and the Immune System by Paula Goines, B.S., Paul Ashwood, Ph.D., and Judy Van de Water, Ph.D.).

There are reported cases that some children with autism have substantially or completely recovered. Commonweal, a non-profit health and environmental research institute, is conducting an autism recovery documentation project that will provide a detailed report of a number of verifiable recoveries from ASD (see Helping to Shift the Paradigm: Learning More About Recovery in Autism by Robert Sinaiko).

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There is not a full population count of all individuals with an ASD in the United States. However, using the prevalence data stated above, we can estimate that if 4 million children are born in the United States every year and assuming the prevalence rate has been constant over the past two decades, we can estimate that up to 560,000 individuals between the ages of 0 to 21 have an ASD. However, many of these individuals may not be classified as having an ASD until school-age or later.

The specific cause of ASD is not known however researchers around the world are exploring different theories and trying to identify the specific gene or genes that may cause autism. It is known that there are biological or neurological differences in the brains of people with autism. There are several outdated theories concerning the cause of ASD; it is not caused by bad parenting and it is not a mental illness.

Studies suggest the prevalence is somewhere between 1 in 200 - 500. In recent years there has been a large increase in the number of children diagnosed with ASD, particularly those in the high functioning category. This is probably due to a broadening of the criteria for diagnosis, and better diagnostics methods enabling detection at a very young age.

Autism is diagnosed by examining the child’s development and behaviours. Sometimes autism can be difficult to diagnose so it is important to have a comprehensive assessment to distinguish ASD from a range of other difficulties. assessment by a paediatrician is required prior to an assessment for ASD in order to rule out other factors including medical conditions that may be affecting the child’s development and behaviour. A hearing assessment may also be required.

There is no proof that Social Phobia is hereditary. Some epidemiologic data suggest it, but there are not enough elements to warrant a conclusion. The same occurrence in one of the parents cannot be regarded as evidence. A person's self-concept, values, and beliefs, as well as many current feelings and emotions, may have their roots in childhood, when the self was being formed.

Yes, heredity plays a role. In one out of five persons with alopecia areata, someone else in the family also has it. Those who develop alopecia areata for the first time after the age of thirty years have less likelihood that another family member will have it. Those who develop their first patch of alopecia areata before the age of thirty have a higher possibility that other family members will also have it.

There is an increase in AMD among children of AMD patients. This is one more reason why your children, after age 40, should have regular eye exams at least every other year.