A suicide method is any means by which a person purposely kills themself. Examples of methods that have been used to kill oneself are listed below. Although individuals with suicidal feelings may consider these methods, most people eventually do not act upon them.
Suicide methods can be classified according to two modes of interrupting life processes: physical or chemical. Physical modes of interruption typically act by incapacitating the respiratory system or the central nervous system, usually by destruction of one or more key components. Chemical modes focus on interrupting biologically significant processes such as inhibition of cellular respiration or reduction of diffusion capacity. Chemical methods of suicide produce latent evidence of action, while physical methods provide direct evidence.
- Main article: Bleeding
- See also: Self mutilation
Exsanguination is a method of death which is caused by blood loss. It is usually the result of damage inflicted on arteries. The carotid, radial, ulnar, or femoral arteries may be targeted. Death may occur directly as a result of the desanguination of the body or via hypovolemia, wherein the blood volume in the circulatory system becomes too low and results in the body shutting down.
This method attempts to self-inflict a class IV haemorrhage by traumatic bleeding. Standard emergency bleeding control applies for pre-hospital treatment -- i.e. elevation and direct pressure; application of tourniquets should be reserved for professionals if used at all.
- Main article: Drowning
Suicide by drowning is the act of deliberately submerging oneself in water or other liquid and staying there long enough to prevent breathing and deprive the brain of oxygen. If the drowning is stopped before death, oxygen deprivation can cause brain damage.
Drowning is among the least common methods (typically less than 2% of all reported suicides in the United States for 2005) 
Suicide by suffocation is the act of inhibiting one's ability to breathe or to limit the oxygen uptake while breathing, which causes asphyxia (by all methods excluding drowning). Inert gasses, such as helium, argon, and nitrogen, are sometimes used, because breathing inert gas causes loss of consciousness and death without ever experiencing air hunger.
Suicide by electrocution involves using a lethal electric shock to kill oneself. A high enough voltage can overcome the high resistance of the skin and pass a sizeable current through the body. A large alternating current through the body can seriously disrupt nerve signals and can cause the heart to go into fibrillation.
Many people have killed themself by jumping or falling from high altitudes (eg from a cliff, dam, bridge, ...). Also, many people have killed themself by defenestration, whereby they throw themselves out of a high window.
Jumping is among the least common methods- typically less than 2% of all reported suicides in the United States for 2005.
A common suicide method is to use a firearm. Some research shows an association between household firearm ownership and gun suicide rates, while other research indicates no such association between firearm ownership and gun suicide rates. During the 1980s and early 1990s, there was a strong upward trend in adolescent suicides with a gun, as well as a sharp overall increase in suicides among people aged 75 and older. In the United States, firearms remain the most common method of suicide, accounting for 53.7% of all suicides during 2003. Unlike in the U.S., the suicide rates with guns in countries where firearms are uncommon are similarly uncommon, with other methods typically being used for suicide.
Research also indicates no association vis-à-vis safe-storage laws of guns that are owned, and gun suicide rates, and studies that attempt to link gun ownership to likely victimology often fail to account for the presence of guns owned by other people. Researchers have shown that safe-storage laws do not appear to affect gun suicide rates or juvenile accidental gun death.
- Main article: Hanging
Jumping, lying, or standing in front of a fast-moving vehicle, especially a large one, such as a truck, can prove fatal.
Suicide involving trains is a significant problem in some jurisdictions.
This may be traumatizing to the driver of the train and may result in them suffering PTSD requiring treatment. Suicide by being hit by a train has a 10% survival rate. Not dying following impact of the vehicle could result in massive body damage including amputations, fractures, brain damage, organ bruising, and disability.
In some European countries with highly developed rail networks and very strict gun-control laws, such as Germany and Sweden, railway-related suicide is considered a social problem, and extensive research has been carried out into this type of suicide. According to these studies, most suicides occur in densely populated areas, but away from train stations and terminal points. Wooded areas, curves and tunnels are especially plagued. Most suicides occur at evening or night time, with reduced visibility for the driver.
Studies have shown that people who kill themself in this manner usually stay at or around the suicide location for an extended period of time before the actual suicide. Unlike suicides in the underground, they rarely or never jump in front of the train, but rather stand or lie on the tracks, waiting for the arrival of the train. As the trains usually keep high speeds, at around 80 km/h for regular trains and around 200 km/h or more for high speed trains, the driver is usually unable to bring the train to a halt before hitting the suicide candidate. Drivers are often traumatized and suffer from post-traumatic stress disorder.
In Germany, 10% of all suicides occur in this manner. Germany is the country where railway related suicides account for the largest share of overall suicides. Railway related suicides are also common in Britain and Japan.
Methods to reduce the number of rail-related suicides include video surveillance of stretches where suicides frequently occur, often with direct links to the local police or surveillance companies. This enables the police or guards to be on the scene within minutes after the trespassing was noted. Public access to the tracks is also made more difficult by erecting fences. Trees and bushes are cut down around the tracks in order to increase driver visibility.
Jumping in front of an oncoming subway train has a 67% survival rate, much higher than the 10% survival rate for rail-related suicides. Jumping in front of an underground train is a comparatively common form of suicide in many larger cities, such as London.
Different methods have been used in order to decrease the number of suicide attempts in the underground: a deep drainage pit halves the likelihood of fatality. Separation of the passengers from the track by means of a partition with sliding-doors is being introduced in some stations but this is expensive.
Some car accidents are in fact suicides. This especially applies to single-occupant, single-vehicle accidents. "The automobile lends itself to attempts at self-destruction because of the frequency of its use, the generally accepted inherent hazards of driving, and the fact that it offers the individual an opportunity to imperil or end his life without consciously confronting himself with his suicidal intent".
The real percentage of suicides among car accidents is not reliably known; studies by suicide researchers tell that "vehicular fatalities that are suicides vary from 1.6% to 5%".  Some suicides are misclassified as accidents because suicide must be proven; "It is noteworthy that even when suicide is strongly suspected but a suicide note is not found, the case will be classified 'accident.'"
Some researchers believe that suicides disguised as traffic accidents are far more prevalent than previously thought. One large-scale community survey among suicidal persons provided the following numbers: "Of those who reported planning a suicide, 14.8% (19.1% of male planners and 11.8% of female planners) had conceived to have a motor vehicle “accident”... Of all attempters, 8.3% (13.3% of male attempters) had previously attempted via motor vehicle collision."
Suicide can be done by using fast-acting poisons (e.g. HCN- hydrogen cyanide), or substances which are known for their high levels of toxicity to humans. Poisoning is more common amongst occupational groups who have access to chemicals such as farmers. Poisioning by farm chemicals is common among females in the Chinese countryside, and is regarded as a major social problem in the country.
Suicide by pharmaceuticals ("overdosing") is a method which involves taking medication in doses greater than the indicated levels, or in a combination which will enhance each drug's effect.
Reliability of this method depends on chosen drugs and additional measures like use of antiemetics to preventing vomiting. Average fatality rate for overdoses in the US is estimated to be 1.8% only. At the same time, assisted suicide group Dignitas reported no single failure among 840 cases (fatality rate 100%), where an overdose of a former sleeping pill active agent Nembutal was used in combination with antiemetic drug.
While barbiturate (like Seconal or Nembutal) are considered a safe option for suicide, it is becoming increasingly difficult to acquire these drugs. Today they are only available as a dilution and are used by veterinarians to euthanize animals. Dutch right to die society WOZZ proposed several safe alternatives to barbiturates for use in euthanasia.
However, a typical drug overdose uses random prescription and over-the-counter substances. In this case death is uncertain, and an attempt may leave a person alive but with severe organ damage, which may prove eventually fatal itself. Drugs taken orally may also be vomited back out before being absorbed. Considering the very high doses needed, vomiting or falling asleep before taking enough of the active agent might be a serious hurdle.
Analgesic overdose attempts are among the most common due to easy availability of over-the-counter substances. Overdosing may also be performed by mixing medications in a cocktail with one another, or with alcohol or illegal drugs. This method may leave confusion over whether the death was a suicide or accidental, especially when alcohol or other judgment-impairing substances are also involved and no suicide note was left behind.
Drug overdose as a method is more prevelent amongst occupational groups that have access to the drugs, such as doctors and dentists.
Carbon monoxide poisoning
- Main article: Carbon monoxide poisoning
A particular type of poisoning involves inhalation of high levels of carbon monoxide. Death usually occurs through hypoxia. Carbon monoxide is a colorless and odorless gas, so its presence cannot be detected by sight or smell. It is harmful to humans since the CO molecules attach themselves to hemoglobin in the blood, displacing oxygen molecules and progressively lowering the body's oxygenation, eventually resulting in death.
Several insects such as spiders, snakes, scorpions, etc., carry venoms that can easily and quickly kill a person. Evidence that any particular death is due to suicide is problematic so reliable estimates of the prevalence of this method are hard to come by
Immolation usually refers to suicide by fire. It has been used as a protest tactic, most famously by Thich Quang Duc in 1963 to protest the South Vietnamese government; and by Malachi Ritscher in 2006 to protest the United States' involvement in the Iraq war. The Latin root of 'immolate' means 'sacrifice', and is not restricted to the use of fire, though common media usage uses the term immolation to refer to suicide by fire.
- Main article: Seppuku
Seppuku (colloquially harakiri "belly slitting") is a Japanese ritual method of suicide, practiced mostly in the medieval era, though some isolated cases appear in modern times. For example, Yukio Mishima the novelist used the seppuku method in 1970, after a failed coup d'etat that intended to restore full power to the Japanese emperor.
Unlike other methods of suicide, this was regarded as a way of preserving one's honor. The ritual is part of bushido- the code of the samurai.
Apocarteresis (suicide by starvation)
- Main article: Starvation
Starvation has been used by Hindu, Jain, and Buddhist monks as a ritual method of suicide. Albigensians or Cathars also fasted after receiving the 'consolamentum' sacrament, in order to die while in a morally perfect state.
A hunger strike may ultimately lead to death.
- Main article: Terminal dehydration
Terminal dehydration has been described as having substantial advantages over physician-assisted suicide with respect to self-determination, access, professional integrity, and social implications. Specifically, a patient has a right to refuse treatment and it would be a personal assault for someone to force water on a patient, but such is not the case if a doctor merely refuses to provide lethal medication. But it also has distinctive drawbacks as a humane means of voluntary death. One survey of hospice nurses in Oregon (where physician-assisted suicide is legal) found that nearly twice as many had cared for patients who chose voluntary refusal of food and fluids to hasten death as had cared for patients who chose physician-assisted suicide. They also rated fasting and dehydration as causing less suffering and pain and being more peaceful than physician-assisted suicide. There can be a fine line between terminal sedation that results in death by dehydration and euthanasia.
Studies have shown that for terminally ill patients who choose to die, deaths by terminal dehydration are generally peaceful, and not associated with suffering, when supplemented with adequate pain medication. All ages may feel sudden head rushes, dizziness, and loss of appetite, as well.
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- WISQARS leading death reporting
- WISQARS leading death reporting
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