Animals in this study also demonstrated several other types of eating behaviour: "weak eating," in which the animal slowly approaches, chews, and swallows small observable amounts of food for a brief period; "good eating," in which the animal reaches normally for the food and eats reliably; and "vigorous eating," in which the animal gluttonously reaches for and devours the food. In these cases, there was either minor or no damage to the lateral hypothalamus.Aphagia not classified under behavioral aphagia typically has a structural cause, see causes. Causes
Aphagia is usually the result of many different diseases as well as different medical treatments. The most common causes of aphagia are:

Aesophageal cancer – there are two types of aesophageal cancer. The squamous cell cancer from the squamous cells of the tongue or the adenocarcinoma from glandular cells present at the junction of the esophagus and stomach. This leads to a local tumour growth with spreading later. This spreading may lead to larger tumors that would result in the inability to swallow. Aesophageal webs – thin membranes located in the esophagus. Abnormalities can cause constrictions within the esophagus. Globus pharyngis – commonly referred to as lumps in ones throat
Myasthenia gravis – the thymus gland is thought to be necessary for the deletion of auto-reactive T cells, and seems to have an important role in the pathogenesis of myasthenia gravis. In patients the thymus is typically enlarged, and contains many germinal centres with T and B cell areas very similar to those seen in lymph nodes.
In the absence of heart failure, hypertension, with or without enlargement of the heart (left ventricular hypertrophy) is usually symptomless.Symptoms, signs and consequences of congestive heart failure can include:

Fatigue
Irregular pulse or palpitations
Swelling of feet and ankles
Weight gain
Nausea
Shortness of breath
Difficulty sleeping flat in bed (orthopnea)
Bloating and abdominal pain
Greater need to urinate at night
An enlarged heart (cardiomegaly)
Left ventricular hypertrophy and left ventricular remodeling
Diminished coronary flow reserve and silent myocardial ischemia
Coronary heart disease and accelerated atherosclerosis
Heart failure with normal left ventricular ejection fraction (HFNEF), often termed diastolic heart failure
Atrial fibrillation, other cardiac arrhythmias, or sudden cardiac deathHeart failure can develop insidiously over time or patients can present acutely with acute heart failure or acute decompensated heart failure and pulmonary edema due to sudden failure of pump function of the heart. Sudden failure can be precipitated by a variety of causes, including myocardial ischemia, marked increases in blood pressure, or cardiac arrhythmias. Diagnosis
Differential diagnosis
Other conditions can share features with hypertensive heart disease and need to be considered in the differential diagnosis. For example:
Coronary artery disease or ischemic heart diseases due to atherosclerosis
Hypertrophic cardiomyopathy
Left ventricular hypertrophy in athletes
Congestive heart failure or heart failure with normal ejection fraction due to other causes
Atrial fibrillation or other disorders of cardiac rhythm due to other causes
Sleep apnea

Prevention
Because there are no symptoms with high blood pressure, people can have the condition without knowing it.