Tasting and smelling things that are "not there" can be caused by many things...a few are: fungal infections in the sinus cavities and some medications. Metallic tastes and smells can be from medications. It can make you feel insane to taste and smell things that you know you have not tasted/eaten. If you are noticing this all the time or if it comes and goes, it is probably best to go to an ENT...ear, nose and throat physician. Some epileptics note a different taste or smell right before they have a seizure..a form of aura.
The sensations experienced in dreams, such as visual images, smells, sounds and tastes, come directly from the unconscious mind which draws on remembered experiences of those sensations. Sometimes a factor in the sleeper's environment might trigger a sensation in a dream; for example, food being cooked in a nearby kitchen can cause a sleeper to dream about breakfast. But such triggers are not necessary. The sleeping mind is fully capable of creating dreams filled with convincing sensations.
Oil of wintergreen and spearmint is used for flavouring both candy and toothpaste.
Gradual blockage creates muscle aches and pain, cramping, and sensations of tiredness or numbness; sudden blockage may cause severe pain, coldness and numbness.
Sensations or perceptions without an external cause are typically referred to as hallucinations. Hallucinations can be experienced through any of the five senses and are often associated with conditions such as psychosis, dementia, or substance abuse. Treatment for hallucinations may involve addressing the underlying cause and may include medication or therapy.
There are 5 tastes. The traditional 4 of sweet, bitter, salty, and sour, and a somewhat recently discovered umami. The umami taste is stimulated by monosodium glutamate and is associated with the taste of meat. The combination of these five tastes cause the unique taste perceptions of various foods. drazx is the original author of this answer
Sudden hypercalcemia can cause vomiting and coma
Reverse osmosis removes substances that would otherwise cause the water supply to be unhealthy or unappealing, for instance foul tastes, smells or colours. Also removes salts and minerals (lead/mercury)
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generally do not cause pain. Patients sometimes report pinching sensations and often pleasant sensations, as the body experiences healing
The appearance of a material can be characterized by the way it looks, smells, tastes, sounds and feels. The presence of an impurity can cause deformities in the appearance of a material.