### condition | problem:

Gastrointestinal problem
* Some gastrointestinal problems can prevent protein from being used by the body.
* are common in the pet rabbit
  - frequent
* associated with gluten are rare in dogs.
* can also occur
  - occurs from the vomiting or the use of laxatives
* including nausea, vomiting, and loss of appetite is also very common.

Genetic problem
* Some genetic problems are caused by a single gene that is present but altered in some way.
* tend to accumulate in isolated populations such as in a quarantine country.

### condition | problem:

Heart problem
* Most heart problems are exacerbated by pregnancy
  - run in families
* Some heart problems are actually due to heart worms.
* Some heart problems cause breathing distress only when one is lying down or sleeping
  - problems only when one is lying down or sleeping
  - have to be fixed as soon as the baby is born
* are another common problem among prematurely born babies
* can arise, however, usually as secondary complications due to granulomas in the lung
  - come from pressure in the upper thoracics
  - occur because of fear and stress
* result from reduced strength of the heart muscle caused by longterm alcohol abuse.
* take on a variety of forms and evolve over time.
* vary widely in their nature and severity.

Human problem
* Many human problems have an environmental dimension.
* solving is recursive, general, and hierarchical.

### condition | problem:

Important problem
* Most important problem involved in the practical use of hydrogen car is hydrogen storage materials.
+ Hydrogen car, Problem to solve for the practical use of hydrogen car: Vehicles
  * Most important problem involved in the practical use of hydrogen car is hydrogen storage materials. If it uses a fuel cell that generates electricity through reaction between hydrogen and oxygen, it does not matter. However, if method is that hydrogen is sprayed to internal-combustion engine, it does matter. Now hydrogen storage tank with highest possibility is method using metal hydride. Metal hydride is that reversible reaction between metal and hydrogen make new form of compound. Now Hydrogen storing technology using Hydrogen storage compound metal comes to practical use step in the side of technical, however, hydrogen storing capacity per weight is no match for demand of user, so this technology does not wide use yet.

Joint problem
* are common in meat animals fed high nutrient diets for maximal gowth and weight gain.
* caused by injuries or overuse increase the risk of osteoarthritis.

Kidney problem
* Some kidney problems happen quickly, like an accident that injures the kidneys.
* include acute injuries
  - kidney injuries

Liver problem
* Most liver problems relate to deficiencies.
* are one of many causes of infertility.
* can occur when used in excess.
* show up first as a loss of appetite, vomiting, or diarrhea.

Major problem
* face communities.
* involve exchanges
  - gas exchanges
* occur in areas.

Many problem
* occur in contexts
  - ecological contexts
* result in breathe difficulty

Marital problem
* are never the result of one person alone.
* increase the likelihood of depression, especially in women.

### condition | problem:

Medical problem
* Many medical problems can cause loss of sight.
* Most medical problems relate to poor husbandry and malnutrition.
* Some medical problems affect men
  - can trigger weight gain
  - face dogs
  - occur in hamsters
  - require regulation of dietary potassium
* are frequently the result of dangerous life styles.
* associated with smoking tobacco are normally the result of long-term use.
* can also cause sleeplessness
* include infection.
* lead to similar symptoms
* need immediate treatments
* require attention.