Strong Tea contains higher levels of fluoride, Tannic acid, Caffeine, and theobromine, which can excite the central nervous system when consumed in large quantities or over a long period. This may lead to insomnia. Additionally, it may have adverse effects on the gastrointestinal tract, heart, kidneys, and other organs:

1. Central Nervous System: The caffeine and theobromine in strong tea can increase the excitability of the central nervous system, leading to excessive stimulation of the brain and potentially causing insomnia.

2. Gastrointestinal Tract: Caffeine and theobromine in strong tea can stimulate gastric juice secretion and accelerate gastrointestinal motility. Long-term consumption of strong tea can irritate the gastric mucosa, causing symptoms such as nausea, vomiting, and diarrhea. It also increases the risk of conditions like gastritis, gastric ulcers, and duodenal ulcers.

3. Heart: Drinking strong tea can excite the sympathetic nervous system, leading to an increased heart rate. For patients with hypertension or heart disease, consuming large amounts of strong tea may worsen their condition or cause other discomforts.

4. Kidneys: Strong tea contains fluoride, which is primarily metabolized by the kidneys. Drinking strong tea and ingesting large amounts of fluoride can increase the renal burden. Additionally, the high content of tannic acid in tea can contribute to the formation of kidney stones when consumed regularly.

5. Other: During medication treatment, consuming large amounts of strong tea can reduce the effectiveness of drugs to a certain extent. The components in strong tea can inhibit the efficacy of drugs or cause them to break down, which is detrimental to the treatment of diseases. Furthermore, drinking strong tea may affect the body's absorption of calcium and accelerate its excretion, leading to insufficient calcium levels, osteoporosis, and even fractures. Additionally, the high tannic acid content in strong tea can impact iron absorption, leading to anemia and related issues.

It is recommended to drink less or avoid strong tea altogether to prevent adverse effects on the body. Instead, you can consume moderate amounts of lightly brewed tea water.