Fever

, which rises above normal values ​​(36.4 / 37.2 ° C) remaining below 38 ° C.
Generally, "fever" is considered any increase in body temperature above normal values, of which the low-grade fever, just exceeding the physiological values, represents the minimum variation. However, it should be pointed out that during the day the organism can undergo some slight thermal modulations linked, in particular, to the secretion of some substances, favored by circadian rhythms: it seems that the lowest temperature is reached at 4 in the morning (36.4 ° C), while the upper peak in mid-afternoon (about 37.5 ° C): in this regard, some authors venture to talk about physiological low-grade fever in the afternoon, despite the theory being questioned by other scholars.

, facilitating the release of energy and favoring the speed of propagation of nerve stimuli.

, complain of a subtle rise in standard body temperature values, or slight fever: the condition should not alarm, considering that for the entire ovulatory phase an increase of 0.5 / 0.6 degrees is considered normal. Not surprisingly, monitoring the basal temperature is a method adopted by some women as an index of ovulation, to understand when their body is potentially suitable (or not) for conception. In fact, the physiological temperature of the fertile woman is not constant, but undergoes lowering and elevations based on ovulation: generally, around the 14 / 15th day from the beginning of menstruation (second phase of the ovarian cycle), the basal temperature level it undergoes a notable rise, which coincides with the moment in which the corpus luteum begins the production of progesterone: the slight low-grade fever lasts for the remainder of the cycle.

. Although there are no studies that demonstrate the direct connection between stress and low-grade fever, it seems, however, that strong periods of stress affect the hypothalamic thermoregulation center, "moving" it to a higher temperature than physiological levels, even though it is not true. and own fever: in this regard, stress has been defined as "an" inexplicable cause of basal thermal alteration ". In fact, psychological stress could induce an increase in the basal metabolic rate which is reflected, in fact, in the" excessive heat production responsible for the low-grade fever.
Whereas, by definition, fever is nothing but one defensive reaction of the organism in the face of possible external aggressions, stress could be perceived as a probable dangerous source: in response, the defense reaction is, in this case, the low-grade fever.

so much so that, not causing some symptoms, often you don't even realize you have it: not by chance, in fact, most of the time it goes “unnoticed” and is not recognized, if not by chance.
Low-grade fever, when not persistent, shouldn't be overly alarming: it could instead be worrying when it appears every day. For example, among all the symptoms caused by tuberculosis, the chronic low-grade fever also stands out, which could easily develop into a real fever. Obviously, tuberculosis is a serious disease that must be treated promptly.

), diseases affecting the blood and pathologies of the lymphatic glands. In general, the low-grade fever that affects healthy young people, even if chronic, is not alarming and, as already analyzed, the cause is considered psychogenic (stress); the speech is different for those elderly people, in which the chronic, persistent and apparently inexplicable low-grade fever could indicate more serious diseases, such as neoplasms (a similar clinical picture occurs at the onset of Hodgkin's lymphomas).
In any case, chronic low-grade fever remains an inexplicable mystery for many patients, because the search for the causes that cause it remains an unknown ".