We've all experienced firsthand how stress can occur in cats during their care. Changes in external factors, such as temperature or a new environment, can trigger stress responses in cats, even changes in their internal environment. These stress responses can manifest as external abnormalities like loss of appetite and lethargy, or as internal, unseen bodily reactions. Stress in cats can have both positive and negative effects; if it causes adverse effects, we need to take appropriate measures.
In medicine, stress is a non-specific systemic response. From the cat's internal perspective, stress causes the cat's heart rate to increase, blood pressure to rise, muscles to tense, and the gastrointestinal tract to relax. Simultaneously, the body's catabolism and metabolism to accelerate. The stimuli that trigger a stress response in cats are called stressors. 
I. The beneficial effects of stress
1. Stimulates the excitation and alertness of the central nervous system, thereby facilitating the body's coordination of neuroendocrine responses;
2. Increase cardiac output and blood pressure: Sympathetic-adrenal medullary excitation increases heart rate, strengthens myocardial contractility, and increases peripheral resistance, thereby increasing cardiac output and blood pressure;
3. Bronchiectasis: Stress produces catecholamines, which cause bronchiectasis, thus improving alveolar ventilation.
4. Blood redistribution: When the sympathetic-adrenal medullary system is excited, blood vessels in the skin, abdominal viscera, and kidneys constrict, while the diameter of cerebral blood vessels does not change significantly, and coronary arteries and skeletal muscle blood vessels dilate;
5. Promotes glycogen and fat breakdown: Catecholamines promote lipid mobilization and glycogen breakdown by promoting glucagon secretion and inhibiting insulin secretion.
II. Adverse Effects of Stress
1. Leads to changes in mood and behavior
2. Sustained contraction of blood vessels in the abdominal cavity can lead to ischemia of internal organs.
3. Prolonged vasoconstriction in peripheral small blood vessels can increase blood pressure.
4. Increases blood viscosity and promotes thrombus formation.
5. Increased heart rate leads to increased myocardial oxygen consumption, resulting in myocardial ischemia. 
III. Stress responses in daily life
All animals exhibit stress responses. As long as this response is not excessively strong or prolonged, the resulting stress can effectively mobilize the body's mind and body, helping them cope with unexpected difficulties in daily life. For example, a sudden change in weather causing a cat to become lethargic is a stress response. Similarly, a cat that has played all day may become restless upon encountering strangers; these are also stress responses and are considered normal. These responses help cats adapt to changes in life and are beneficial to them. When you notice changes in your cat's behavior, first consider whether external factors have changed. Only by understanding the external causes of the stress response can you fundamentally resolve the problem. Furthermore, if a cat is taken to the vet without strenuous activity or any pathological signs, but its temperature remains consistently higher than normal, this is also a sign of stress.
3.1 Stress triggered by unfamiliar environments
An unfamiliar environment can be psychologically traumatic for cats, and it can also be physically challenging. When cats enter a new environment, they often exhibit overly excited behaviors such as screaming, running around, and biting. In addition, they may show signs of maladjustment by hiding for extended periods, refusing to eat, or defecating indiscriminately. Owners should not be annoyed by this, but rather allow and understand the cat's "nostalgia" and give them ample time to adapt.
3.1.1 Solution
It generally takes cats 1-2 weeks to fully adapt to a new environment. During this time, owners should not confine them to small cages, as enclosed spaces can exacerbate their fear. Owners can open the cage door and roof to allow them to move freely, and freed cats will adapt to their new environment more quickly. Conversely, placing cats directly in a large room can also cause them stress. Therefore, a bedroom or study of suitable size is a good place for them to stay.
To help your cat adapt to a new environment more quickly and effectively, place items it used before in the room, such as food bowls and cat beds, and try to provide food of the same brand and flavor as before. If you want to change its original habits, the best way is to mix the old food with the new food, or mix the used cat litter with the new cat litter. This way, cats with a keen sense of smell will find a sense of "nostalgia" in the new room and will naturally be less nervous.
3.2 Stress in cats at the hospital
Hospitals are also places where cats are prone to stress. Cats are brought to the vet because of illness, and the hospital environment often makes them anxious, causing significant harm to their condition. Stress can cause elevated blood pressure, blood sugar, and white blood cell counts in cats; deviations in these crucial laboratory data can mislead medication and treatment. Furthermore, primary stress can lead to fatty liver disease in cats, causing jaundice and liver cell damage. Some cats may also develop lower urinary tract syndrome, self-harming psychotic disorders, and other similar conditions.
3.2.1 Solution
To minimize the risk of cats becoming anxious and losing control, hospitals must meet their needs in both hardware and software aspects. Firstly, regarding hardware: A comfortable treatment environment must be provided for cats, with separate examination rooms for dogs and dedicated rooms for cats. Place items the cat likes in the examination room to reduce feelings of unfamiliarity. The inpatient ward should also use large, cat-specific cages with litter boxes where cats can move freely. Secondly, regarding software: Medical staff must understand and be familiar with feline habits, avoiding impatience before contact, and engaging in thorough communication and bonding with the cat, using gentle and quiet movements. Only through consistent contact and approach can the cat's anxiety and unease be gradually alleviated. This process may be lengthy, and setbacks and difficulties may occur along the way; however, our only option is perseverance, patience, and continuous effort.
