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  2. Tired light - Wikipedia

    en.wikipedia.org/wiki/Tired_light

    Tired light is a class of hypothetical redshift mechanisms that was proposed as an alternative explanation for the redshift-distance relationship. These models have been proposed as alternatives to the models that involve the expansion of the universe. The concept was first proposed in 1929 by Fritz Zwicky, who suggested that if photons lost ...

  3. Is It Normal to Feel Lightheaded Every Day? - AOL

    www.aol.com/normal-feel-lightheaded-every-day...

    It's recommended to drink between nine and 13 cups of water every day, depending on your age, sex and activity level. The reason why dehydration can cause lightheadedness is because it can lead to ...

  4. Lightheadedness - Wikipedia

    en.wikipedia.org/wiki/Lightheadedness

    Lightheadedness is a common and typically unpleasant sensation of dizziness [1] or a feeling that one may faint. The sensation of lightheadedness can be short-lived, prolonged, or, rarely, recurring. In addition to dizziness, the individual may feel as though their head is weightless. The individual may also feel as though the room is "spinning ...

  5. Hypoxia (medicine) - Wikipedia

    en.wikipedia.org/wiki/Hypoxia_(medicine)

    Hypoxia is a condition in which the body or a region of the body is deprived of adequate oxygen supply at the tissue level. [1] Hypoxia may be classified as either generalized, affecting the whole body, or local, affecting a region of the body. [2] Although hypoxia is often a pathological condition, variations in arterial oxygen concentrations ...

  6. Pacemaker syndrome - Wikipedia

    en.wikipedia.org/wiki/Pacemaker_syndrome

    Pacemaker syndrome is a condition that represents the clinical consequences of suboptimal atrioventricular (AV) synchrony or AV dyssynchrony, regardless of the pacing mode, after pacemaker implantation. [1][2] It is an iatrogenic disease—an adverse effect resulting from medical treatment—that is often underdiagnosed. [1][3] In general, the ...

  7. Clouding of consciousness - Wikipedia

    en.wikipedia.org/wiki/Clouding_of_consciousness

    Clouding of consciousness, also called brain fog or mental fog, [1][2] occurs when a person is slightly less wakeful or aware than normal. [3] They are less aware of time and their surroundings, and find it difficult to pay attention. [3] People describe this subjective sensation as their mind being "foggy".

  8. Lethargy - Wikipedia

    en.wikipedia.org/wiki/Lethargy

    Lethargy. Lethargy is a state of tiredness, sleepiness, weariness, fatigue, sluggishness, or lack of energy. It can be accompanied by depression, decreased motivation, or apathy. Lethargy can be a normal response to inadequate sleep, overexertion, overworking, stress, lack of exercise, improper nutrition, drug abuse, boredom, or a symptom of an ...

  9. Orthostatic hypotension - Wikipedia

    en.wikipedia.org/wiki/Orthostatic_hypotension

    Orthostatic hypotension is defined as a fall in systolic blood pressure of at least 20 mmHg or the diastolic blood pressure of at least 10 mmHg between the supine reading and the upright reading. Also, the heart rate should be measured for both positions.