However, abstaining from hallucinogenic drugs, stimulant drugs, managing stress levels, living healthily, and getting plenty of sleep can help reduce the prevalence of hallucinations. In all cases of hallucinations, medical attention should be sought out and informed of ones specific symptoms. Meta-analyses show that cognitive behavioral therapy and metacognitive training can also reduce the severity of hallucinations. Epidemiology
Prevalence of hallucinations varies depending on underlying medical conditions, which sensory modalities are affected, age and culture. As of 2022, auditory hallucinations are the most well studied and most common sensory modality of hallucinations, with an estimated lifetime prevalence of 9.6%. Children and adolescents have been found to experience similar rates (12.7% and 12.4% respectively) which occur mostly during late childhood and adolescence. This is compared with adults and those over 60 (with rates of 5.8% and 4.8% respectively). For those with schizophrenia, the lifetime prevalence of hallucinations is 80% and the estimated prevalence of visual hallucinations is 27%, compared to 79% for auditory hallucinations. A 2019 study suggested 16.2% of adults with hearing impairment experience hallucinations, with prevalence rising to 24% in the most hearing impaired group.A risk factor for multimodal hallucinations is prior experience of unimodal hallucinations. In 90% cases of psychosis, a visual hallucination occurs in combination with another sensory modality, most often being auditory or somatic.
In extravascular hemolysis, red blood cells are phagocytized by macrophages in the spleen and liver.Abnormal value of hemoglobin does not necessarily indicate a medical problem needing treatment. Diet, activity level, medications, a womens menstrual cycle, and other considerations can affect the results. Additionally to these, one may have higher than normal hemoglobin if he/she lives in a high altitude area. Causes
There are other causes besides what happens within the body in the blood cells. Other factors that can cause an excess amount of hemoglobin are:

Smoking (which may result in low blood oxygen levels)
Higher altitudes where your red blood cell production naturally increases to compensate for the lower oxygen supply thereSpecific disorders or other factors that may cause a high hemoglobin count include:

Lung disease
Heart disease
COPD (chronic obstructive pulmonary disease)
Dehydration
Emphysema
Heart failure
Kidney cancer
Liver cancer
Other types of heart disease
Other types of lung disease
Polycythemia vera, a disorder in which your body makes too many red blood cells. It can cause headaches, fatigue, and shortness of breath. Diagnosis
Normal hemoglobin levels
Normal hemoglobin levels correlate with the persons age and sex. Levels can vary between different testing systems and under their doctors consultation. A hemoglobin test measures the amount of hemoglobin in your blood. If a hemoglobin tests shows that a persons levels are below normal, it means they have a low red blood cell count, which is known as anemia. If the test shows higher levels than normal, it means they have hemoglobinemia.The normal range for hemoglobin is:

For men, 13.5 to 17.5 grams per deciliter.