Main
- Pathogen: Giardia cysts are resistant in the external environment and persist in water and on food until they enter the intestine.
- Route of infection: cysts enter the mouth with unboiled water, unwashed vegetables, fruit, herbs and dirty hands.
- Symptoms: irregular stools, bloating, nausea, reduced appetite, heaviness in the upper abdomen and fatigue.
- Diagnosis: stool test for cysts, immunological and complete blood count, sometimes examination of the contents of the duodenum.
- Doctors: an infectious disease specialist, a gastroenterologist, and in their absence — a physician or paediatrician for an initial examination.
What is giardiasis
Giardiasis is an intestinal infection caused by protozoan microorganisms that live in the human small intestine. The disease often runs with digestive upset and may go without noticeable symptoms for a long time.
What happens in the body
The causative agent enters the body through contaminated water or food when a person swallows cysts excreted in faeces. Cysts are resistant in the environment and can survive in water and on food until they reach the intestine. In the small intestine, the active form of the protozoan is released from the cyst and attaches to the intestinal wall. This attachment interferes with the normal absorption of nutrients and disrupts the digestion of food. Because of this, a person may feel heaviness in the abdomen, bloating and irregular stools. Over time, impaired absorption affects the general condition and the tolerance of usual food. If digestive upset persists for a long time and recurs, it is worth discussing this with a doctor rather than putting it down to an occasional dietary slip.
What causes it
- Drinking unboiled water from open sources: water from rivers, ponds and wells may contain cysts, and boiling destroys them.
- Unwashed vegetables, fruit and herbs: particles of soil and water remain on the skins and leaves, which serve as a source of infection.
- Failure to observe personal hygiene rules: unwashed hands after being outside, using the toilet and contact with soil carry cysts to the mouth.
- Contact with domestic and wild animals: animals can excrete the causative agent in their faeces, so it is important to wash your hands after being around them.
- Staying in places with a low level of sanitation: shared water, crowding and the absence of conditions for hygiene increase the risk of infection.
Who encounters it more often
Infection occurs more often in people who live or work in conditions with limited access to clean water and sanitation. In children's groups, the causative agent spreads faster because children are in close contact with each other and observe hand hygiene less often. Holidaymakers near open water bodies and tourists who drink water from unverified sources are also in the risk group. Livestock workers and people who often spend time in rural areas encounter the causative agent through contact with animals and soil. The general state of the body also matters: with a weakened immune system, infection is tolerated more severely and for longer. Crowding in hostels, camps and boarding schools creates conditions for the rapid transmission of cysts from person to person. If a person often stays in such places, it is reasonable to pay closer attention to the quality of water and to washing hands.
What symptoms can occur?
Giardiasis can go unnoticed for a long time, and its first manifestations are easily mistaken for ordinary fatigue or indigestion. Monitoring digestion and general well-being helps to understand when it is time to see a doctor.
How it is noticed at the very beginning
At the beginning, giardiasis often manifests as decreased appetite and unpleasant sensations in the upper abdomen. A person begins to tire more quickly, although the workload and daily routine have not changed. These signs are easily attributed to overwork, lack of sleep or ordinary indigestion after eating. Gradually, abdominal bloating and increased gas formation are added to them, recurring more and more often. Stools become unstable: loose stools alternate with constipation, and this too is not linked to infection. Due to constant discomfort, a person begins to eat less and avoid usual dishes. If such signs persist for weeks, it is worth seeing an infectious disease specialist or a gastroenterologist.
Signs that occur most often
- Loose stools: loose stools or alternating constipation and diarrhoea disrupt the usual rhythm and indicate a digestive disorder.
- Abdominal bloating: increased gas formation distends the abdomen, creates a feeling of fullness and interferes with normal eating.
- Nausea and decreased appetite: these signs appear unrelated to food and gradually lead to weight loss.
- Unpleasant sensations in the upper abdomen: heaviness or discomfort under the ribs intensify after eating.
- Fatigue and general weakness: strength declines even with ordinary exertion, and rest does not restore vigour.
- Skin rashes or itching: such skin reactions are visible from the outside and often cause concern without an apparent cause.
When to seek urgent help
Examinations and tests
Examination for giardiasis begins with a conversation with a doctor and clarification of the circumstances of infection. Laboratory tests help confirm the diagnosis, each of which shows its own side of the process.
How the examination begins
Examination for suspected giardiasis begins with an appointment with a doctor, who collects the patient's complaints in detail. The specialist clarifies the circumstances that could have led to infection, including the quality of drinking water and contacts with possible carriers. Such a conversation is needed because complaints in giardiasis are non-specific and occur in many other conditions. The doctor compares the patient's account with the picture of the disease and decides which particular tests are needed in a specific case. To confirm the diagnosis, laboratory tests are prescribed, since only they show the presence of the causative agent or the body's reaction to it. The referral may include a stool test, an immunological blood test and a complete blood count, and sometimes an examination of the contents of the duodenum. The patient should clarify in advance with the doctor how to properly prepare for each of the prescribed tests.
What is prescribed and what it shows
What to prepare for the appointment
- Discharge summaries: take medical documents from other institutions so that the doctor sees the full picture of your condition from past visits.
- Previous tests: bring the results of earlier tests, if they were done, because comparison helps assess changes.
- List of complaints: write down what bothers you and when, so that you do not forget or miss anything at the appointment.
- Information about water and travel: note sources of drinking water and recent trips, since this helps the doctor understand the possible route of infection.
- Questions for the doctor: prepare in advance what you want to clarify about preparing for tests and the timing of receiving results.
Which doctor should I see?
If giardiasis is suspected, it is important to understand which doctor to consult and how care is organised. Below — about the specialists, areas of treatment and the role of the patient themselves.
Which specialist manages this condition
Giardiasis is managed by an infectious disease specialist, and if there are complaints from the digestive system, a gastroenterologist is involved. The infectious disease specialist deals with parasitic diseases and assesses the general condition of the body. The gastroenterologist understands how the stomach and intestines work, so helps with digestive disorders. If there is no specialist of this kind nearby, start with a general practitioner at your place of residence. The general practitioner will listen to the complaints, examine you and refer you to the right specialist. The doctor clarifies the form and severity of the condition, as well as possible concomitant disorders. Further follow-up is carried out until full recovery of well-being. Do not postpone the visit if the complaints persist for a long time and interfere with ordinary life.
What treatment consists of
- Selection of therapy by the doctor: the specialist chooses the areas of care taking into account the form and severity of the condition, and not according to a template.
- Dietary nutrition: a diet on the recommendation of a specialist reduces the load on digestion and helps the body recover.
- Restoration of water and salt balance: with diarrhoea the body loses fluid and salts, so it is important to replenish their supply.
- Monitoring of the condition: the doctor monitors changes in well-being until recovery and, if necessary, adjusts the care.
What depends on the patient themselves
The regularity of follow-up with the doctor largely determines how quickly well-being will be restored. The patient follows the specialist's recommendations and comes to follow-up appointments at the appointed time. If the complaints change or new ones appear, this should be reported to the doctor without delay. Following dietary nutrition requires attention to the diet every day, and not from time to time. With diarrhoea it is important to monitor the replenishment of fluid and salts in order to prevent dehydration. Records of well-being help the doctor see the whole picture and change tactics in time. Only the joint work of the patient and the specialist gives a lasting result, so do not stop follow-up before the due time.
What helps prevent an exacerbation?
This section is about what in everyday behaviour reduces the risk of a giardiasis flare-up. It will cover habits, monitoring how you feel, and regular visits to the doctor.
What to change in your habits
The main prevention of giardiasis is aimed at keeping the causative agent from entering the body. You should drink only boiled or bottled water, especially away from home and when travelling. Vegetables, fruit and herbs are washed thoroughly, even if they look clean on the outside. Hands are washed after using the toilet and before eating, as well as after contact with animals and soil. Swimming in unverified bodies of water is best avoided, since the water may contain the causative agent. These habits reduce the chance of the parasite entering the body again and lessen the burden on the body. If you feel worse, it is worth returning to these rules with particular care.
What to keep under control
- Water quality: boiled or bottled water is used for drinking and washing food, since raw water from open sources may contain the causative agent.
- Hand washing: this habit is reinforced after using the toilet, before eating and after coming in from outside, so as not to transfer the causative agent to food and dishes.
- Handling vegetables and fruit: herbs, vegetables and fruit are washed thoroughly, even when bought in a trusted place, because contamination may go unnoticed.
- Swimming: swimming in unverified bodies of water is avoided, as swallowing water increases the risk of reinfection.
- How you feel: changes in your condition — weakness, heaviness in the abdomen, loose stools — are written down and discussed with the doctor, so as not to miss a flare-up.
- Regular check-ups: routine visits to the doctor are kept up even when you feel well, because a flare-up can develop gradually and unnoticed.
How often to see the doctor
Regular check-ups with the doctor are needed even when you feel well and nothing is bothering you. Giardiasis can run in waves, and a flare-up sometimes develops gradually, without sharp and noticeable signs. The doctor assesses your general condition, clarifies your complaints and, if necessary, orders tests so as to notice changes in time. If weakness, heaviness in the abdomen or loose stools appear, the visit should not be put off for long. A person who follows hygiene and monitors themselves notices changes earlier and reports them at the appointment. Such monitoring helps adjust recommendations in time and prevents the condition from developing into a pronounced flare-up. Routine visits should be kept up, even if it seems there is no cause for concern.
What is worth remembering
Giardiasis is a condition in which it is not so much the name itself that matters, but a sober assessment of one's state and a readiness to act on the facts. Below is what stays with the reader after becoming familiar with the topic.
Key conclusions
Giardiasis requires confirmation, not guesswork: symptoms on their own do not distinguish it from other conditions with similar signs. Giardiasis can go a long time without producing a clear picture, so prolonged malaise is easily put down to tiredness or diet. Giardiasis manifests differently in different people, and the severity of its course is not always visible from outward signs. Giardiasis is not treated at random, relying on advice from a chat or chance stories from acquaintances. Giardiasis is a reason not to put off a visit if feeling unwell interferes with ordinary activities and persists for weeks. Giardiasis does not rule out other causes, so a single finding should not be considered the only explanation for all the symptoms. Giardiasis remains a manageable situation when a person relies on a doctor and on the collected data, rather than on anxiety.
