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Words to know
anesthesiologist
a doctor who gives drugs that block pain during surgery
interventions
actions taken to treat or help with a problem
biochemical
relating to the chemical processes inside living things
methodology
the set of methods used to carry out research
investigators
people who study or research something carefully
pharmacological
relating to how medicines act on the body
accompanies
to happen or exist along with something else
inadvertently
without meaning to, by accident
A The placebo effect refers to a measurable improvement in a patient’s condition after treatment with an inert substance or sham procedure, such as a sugar pill or a saline injection. The word comes from the Latin placebo, meaning “I shall please.” Crucially, the improvement is not produced by any active ingredient. It arises from the context of care itself: the ritual of taking medicine, the reassurance of a clinician, and the patient’s belief that relief is coming. Placebo responses are strongest for subjective complaints such as pain, fatigue, and nausea. Inert treatments do nothing, however, to shrink tumors or eliminate infections.
B Physicians have suspected the power of belief for centuries, although systematic investigation arrived comparatively late. In 1799, the English physician John Haygarth tested a fashionable remedy known as Perkins tractors. These metal rods supposedly drew disease out of the body. Haygarth secretly substituted wooden imitations, and four of his five patients improved anyway. He concluded that imagination alone could produce striking recoveries. More than 150 years later, the American anesthesiologist Henry Beecher published an influential 1955 paper, The Powerful Placebo. Beecher, who had treated wounded soldiers during the Second World War, estimated that around 35 percent of patients across more than a dozen trials responded to inert treatment.
C Contemporary researchers have proposed several overlapping mechanisms. Expectation appears central. Patients who anticipate improvement often experience it, and elaborate interventions such as injections tend to generate stronger responses than pills. Classical conditioning also plays a role. People who have repeatedly taken effective medication learn to associate the act of swallowing a pill with feeling better. The effect has a biochemical dimension as well. In 1978, researchers in San Francisco showed that naloxone, a drug that blocks opioid receptors, also abolished placebo pain relief. This finding indicated that expectation can trigger the release of endorphins, the brain’s own painkilling chemicals.
D The placebo effect occupies an equally important position in the methodology of modern medicine. In a randomized controlled trial, a new drug is typically compared with an identical-looking placebo. The drug can be judged effective only if it outperforms the inert version. Because expectations influence both patients and investigators, the most rigorous studies are double-blind. Neither the participants nor the researchers know who is receiving the genuine treatment until the trial ends. This design became standard in the second half of the twentieth century. It protects results from unconscious bias and allows regulators to separate a drug’s pharmacological action from the improvement that accompanies any convincing therapy.
E Expectation, however, can harm as well as heal. The nocebo effect, from the Latin for “I shall harm,” occurs when negative beliefs generate genuine symptoms. Patients who are warned about possible side effects report headaches, dizziness, or nausea more frequently, even when they have swallowed nothing but an inert pill. In clinical trials, some participants in placebo groups even withdraw because of adverse reactions to a substance with no active ingredient. The nocebo effect therefore creates a dilemma for physicians. They must inform patients honestly about risks without inadvertently producing the very symptoms they describe.
F For decades, the standard objection to prescribing placebos was that they require deception, which is incompatible with informed consent. Research on open-label placebos has complicated that assumption. In a 2010 study at Harvard Medical School, patients with irritable bowel syndrome knowingly took pills labeled as placebos. They reported greater relief than a comparable group receiving no treatment, and similar results have since appeared for chronic pain and fatigue. Supporters argue that honest placebos could offer inexpensive help with few side effects. Critics counter that the benefits are modest, largely subjective, and poorly understood. The ethical debate over harnessing belief, in short, remains unresolved.
Exam practice
Exam-style questions written by ESLDesk for practice.
They are not official IELTS or TOEFL questions, and ESLDesk is not affiliated with the exam providers.
True / False / Not Given
Do the following statements agree with the information in the passage?
Choose True if the statement agrees with the passage, False if it
contradicts the passage, or Not Given if the passage does not say.
Placebo treatments have their greatest impact on symptoms that patients themselves feel and report, such as pain and tiredness.
Show answer
True — Para A: placebo responses are strongest for subjective complaints such as pain, fatigue, and nausea.
In Haygarth's 1799 test, the patients treated with wooden imitations showed no improvement.
Show answer
False — Para B states the opposite: four of his five patients improved anyway.
Placebo injections are more expensive to administer than placebo pills.
Show answer
Not Given — Para C compares injections and pills only for strength of response; the passage never mentions cost.
For a new medicine to be judged effective, it must produce better results than a matching inactive version.
Show answer
True — Para D: the drug can be judged effective only if it outperforms the inert, identical-looking placebo.
Trial participants who receive only inert pills never report unpleasant reactions.
Show answer
False — Para E: placebo-group patients report headaches, dizziness, or nausea, and some even withdraw over adverse reactions.
Matching Headings
The passage has 6 paragraphs, A–F.
Choose the best heading for each paragraph from the list below. There are two extra headings you will not use.
A key tool for judging new medicines
An unresolved debate over honest placebos
Early landmarks in placebo research
The body's natural painkillers
Recovery that comes from care, not chemistry
The placebo's harmful mirror image
How belief may act on the body
Treating wounded soldiers with sugar pills
Show answer
v. Recovery that comes from care, not chemistry — Paragraph defines the effect: improvement arises from the context of care, not any active ingredient.
Show answer
iii. Early landmarks in placebo research — Paragraph recounts Haygarth's 1799 test and Beecher's 1955 paper — the early landmark studies.
Show answer
vii. How belief may act on the body — Paragraph surveys proposed mechanisms: expectation, conditioning, and endorphin release.
Show answer
i. A key tool for judging new medicines — Paragraph explains how placebos underpin randomized, double-blind trials that test new drugs.
Show answer
vi. The placebo's harmful mirror image — Paragraph introduces the nocebo effect, the placebo's negative counterpart, where beliefs cause symptoms.
Show answer
ii. An unresolved debate over honest placebos — Paragraph covers open-label placebo research and the still-unsettled ethical argument it feeds.
Summary Completion
Complete the summary below. Choose no more than two words
from the passage for each answer.
A placebo contains no active drug, yet it can produce genuine relief, above all for symptoms that patients feel and report, such as pain, 1, and nausea. Researchers regard a patient's 2 of relief as central to the effect, and a 1978 experiment suggested that placebos can ease pain by prompting the brain to release its own natural pain-relieving substances, known as 3. Belief can also do harm: through the 4 effect, people cautioned about unwanted reactions sometimes develop those very symptoms even after swallowing a completely inactive pill.
Show answers
fatigue — Para A: 'subjective complaints such as pain, fatigue, and nausea.'
expectation — Para C: 'Expectation appears central' — patients who anticipate improvement often experience it.
endorphins — Para C: the naloxone finding indicated expectation can trigger the release of endorphins.
nocebo — Para E: 'The nocebo effect... occurs when negative beliefs generate genuine symptoms.'
